Wednesday, September 23, 2009

Physics of CO2 Gun: Myths & Reality


Looking through the web sites, forums and blogs devoted to Air Guns we see that users have a lot of questions concerning CO2 guns functioning. And we also notice that there is a lot of information that is not true. For example a person who was interested in Drozd CO2 BB pistol asks an air gun store manager if the muzzle velocity will decrease with every shot. A seller answers that it definitely will, because with every shot the amount of CO2 remaining in the cartridge became less. When I hear statements like this I want to become a writer (at least for a while) and to explain other people what really happens.

So, why the muzzle velocity will not drop?
CO2 guns and pistols are powered by CO2 (carbon dioxide). Notwithstanding a cartridge kind, volume and manufacturer it carries liquefied CO2. The liquid fraction constitutes 80% of CO2 gas in a new sealed cartridge (unless the cylinder was underfilled). 20% of volume is a gas fraction.

Pressure of gaseous CO2 depends on the temperature inside a cylinder (that is usually equal to ambient air temperature). Energy of this pressurized gas is used to power CO2 pistols and rifles. When a portion of gas is spent for a shot a portion of liquefied CO2 turns into equal amount of gas immediately. And interior pressure in a cylinder remains the same. And this process keeping pressure at the same level for quite a long time continues till there is no more liquefied fraction of CO2 in a cartridge. Before this point pressure of gas can be considered as constant. This effect of pressure self-stabilization allows using CO2 to power Air Rifles and Pistols including ones designed for shooting sport.

When all liquefied CO2 is spent some gas will remain in a cylinder and its volume will be equal to volume of a cartridge. After reaching this point the pressure inside the reservoir drops very quickly. It is recommended to waste the rest of gas shooting without pellets before removing a cylinder. If you continue to shoot with pellets there is a risk of pellets jamming inside a barrel because pressure becomes so low that it is not enough to let a projectile leave a barrel. If you do not dry-fire a pistol or a rifle before removing a cylinder a low temperature of CO2 gas escaping from a cartridge when you are taking it away will damage rubber seal. So you will have to change rubber o-rings in order to prevent leakage.

Now let’s try to think how many shots per one cylinder we will have. At atmospheric pressure one liter of CO2 weighs 1.98 gr. So we will get about 6 liters out of 12 gr. reservoir. According to Boyle-Mariotte law for a given mass of gas multyplicating volume by pressure we will get a constant figure (providing the temperature does not change).
P1 x V1=p2 x V2=…const (t=const, m=const)
So at room temperature and 60 bar pressure we will get 99 cc of CO2. Now we deduct 15 cc (a volume a cylinder), that will be spent for the last 10-20 shots without pellets (that we have already mentioned).
99cc-15cc=84cc
This 84 cc will give an energy for full-power shots, that we will make till some liquefied gas remains in a cylinder.

Now, how much gas is needed for one shot? Barrel pressure (a pressure that force a projectile to leave a barrel) is 20-40% of maximum pressure. Knowing a barrel length we can calculate its volume, for example a volume of 6’’ barrel is about 1.5 cc. So, for one cartridge we will have
84cc : 1.5cc=56 shots.

Using Boyle-Mariotte law we can calculate that at 32oF and 30 bar pressure we will have 264 cc of CO2 and twice more shots but their power will be twice less. Under these conditions it will be useless to change a cartridge after a couple of clips, it will not make shots more powerful.
But still when we shoot very quickly we notice that velocity drops. Why does it happen? The matter is that a process of turning liquid fraction into gaseous one demands some heat energy (so-called heat-absorbing process). When you shoot very quickly a temperature inside a cylinder drops, heat energy is not enough and the process of turning liquid into gas slows down.

Thus pressure of every new portion of gas will be lower than pressure of a previous one. In order to prevent this effect it is necessary to make intervals between shots enough to restore a temperature inside a cylinder till air temperature level. Some authors say that when you shoot quickly a pressure inside a cylinder decreases because there isn’t enough time to turn liquefied fraction into gaseous one. But this is not right.

Muzzle velocity depends on gas pressure, volume of gas portion and distance at which a power is affecting a projectile (barrel length). So the fastest velocity will have a gun with longer barrel providing temperature being equal and a portion of gas is optimal for this gun.
Optimal portion of gas allows achieving a high velocity while a volume of spent gas being acceptable. There is also a maximum portion of gas that moves a pellet with a maximum velocity for a given barrel. For example if optimal portion of CO2 will force a projectile to leave a barrel at 360 fps and we will have 40-45 shots per one cartridge, with maximum portion of gas a muzzle velocity will be 380-385 fps and a cartridge will be enough for 25-28 shots. Further increasing of gas portion will give nothing. At the same time if we will take longer barrel, for example 8” instead of 6” a velocity will be 50-65 fps more (gas portion being the same).
It is impossible to achieve such a result by increasing a portion of gas.

Air Gun Maintenance




Careful and, what is more important, regular maintenance is the main condition of reliable Air Gun functioning and safety. There are several basic rules every airgunner should follow.

Never keep your Spring-Piston Air Guns cocked. It causes spring fatigue, thus you will have to change a spring rather often.
If you have charged your CO2 Air Gun with a CO2 cartridge do not keep it charged more than 2 weeks (24 hours is recommended).Rechargeable air-cartridges may serve for a month. Then a day or two are necessary to restore the original form and elasticity of rubber seal.
Using a high-power rifle do remember to tighten all screws that tend to unscrew after 30-40 shots.

Never drop or hit your Air Gun. Many important components of Air Rifles and Air Pistols are often made of silumin (a kind of aluminum alloy) and other fragile materials. Plastic details and wood stocks can also be broken.

It is not recommended to use low-quality cheap pellets, improper or handmade pellets, because they may be jammed in the barrel. Jamming of several pellets may cause an irreversible damage of a rifled barrel after the barrel is cleaned with a ramrod.
Cocking a rifle with a Break Barrel Action hold the barrel with one hand and the butt stock with the other hand. Do not cock it with a jerk carrying the rifle in one hand (in the way cinema heroes do). Move all the levers smoothly with necessary effort. Do not apply excessive effort moving a trigger, a cock or levers. .

Very often if you pull a trigger when your Air Gun safety is “ON SAFE” position you can seriously damage percussion trigger unit.
With the course of time pellets tend to jam in rotary magazines. In this case pulling the trigger with unnecessary effort you can damage a gun.

Some shooters use oil, gasoline or ether in order to increase muzzle velocity. They drop a liquid into the working chamber or inside a pellet itself. When the gun shoots a momentary pressure growing in air chamber leads to oil inflaming that becomes a source of additional energy affecting a projectile (so-called a “dieseling” effect). However combustion products remain in a cylinder and other parts and spoil a piston mechanism. In order to avoid negative consequences of “dieseling” in Spring-Piston Guns it is recommended to use the minimum quantity of oil (a drop or two) and load a rifle with lightweight pellets or felt wadding for the fist three or four shots after oiling. There are also special gun oil with graphitic, molybdenic and silicone additive agent that do not cause a “dieseling effect”.

Do never dry-fire your Spring Piston Air Gun. For a powerful “Magnum” class Air Rifles choose heavy-weight pellets (0.6 gr. and more).

Be careful charging CO2 rifles with CO2 cartridges. Do remember that pressure of leaking gas is 60 bar and the temperature is -94˚ F. Remove and install CO2 cartridges according to manual. For example for installing a cartridge, firstly put a cylinder into a grip then tighten a piercing knob towards CLOSE thus piercing cartridge membrane. For removing a CO2 cylinder turn a piercing knob towards OPEN, until you hear gas start to escape, continue turning the knob, remove a backstrap and drop out a CO2 cylinder. Construction of CO2 device and the actions may be different but the main principle is the same: do not come in contact with the escaping gas.

If the quantity of shots per one CO2 cartridge decreases with the course of time, it may indicate gas leakage. Probably it is time to change o-ring or CO2 feeder unit.
A regularity of examination and cleaning of Air Guns is not as critical as in case of firearms. But proper maintenance will guarantee a long life of your Air Gun. Clean your gun after buying in order to remove factory conservation oil, clean it after shooting and after staying outdoors. If there is a condensate on a gun dry it with a piece of cloth before cleaning. Oiling the gun follow instruction of the manual.

Usually it is not necessary to disassemble a pistol or a rifle before cleaning. If it is necessary to do it follow the user guide. If you are not experienced enough ask an airgunsmith to repair or clean your Air Gun.

Examine the gun before cleaning, if there are any defects of metal and wood parts, unscrewed bolts, rust etc. Then oil the critical points of air compression system, rubber and synthetic rings, piston cup and compression chamber. Make several shots in order to spread the oil inside the mechanism. Use special hard oil for springs of Spring-Piston Air Guns. Oil barrels of powerful (magnum class) rifles after every 40-50 shots otherwise it will shoot less accurately. In CO2 guns oil sealing o-rings after every shooting or changing every third cartridge. Oil the percussion trigger unit after 1500-2000 shots. Oil all the levers and piercing knob of CO2 gun when it is necessary. Wipe the gun. Finely use neutral oil and wipe all the metal components one more time with a piece of cloth. Do never oil wood stock.

AND REMEMBER THE GUN IS ALWAYS LOADED AND READY TO SHOOT.

UMAREX Smith & Wesson 586/686




If you have ever seen UMAREX Smith & Wesson 586/686 or if you were lucky to shoot or own it you will agree that it is one of the best CO2 revolvers ever made.

UMAREX (a company owned by Walther) is a well-known German manufacturer of quality CO2 pistols replicating famous firearms. But in case with Smith & Wesson 586/686 UMAREX managed to outdo itself. The manufacturer tried to do its best making a pellet copy very close to the original precisely copying its design, dimensions and weight (UMAREX replica weighs 60-100 gr. less than the real thing).

The difference between 586 and 686 model is in finishing: 586 is black and 686 is nickel. I prefer a nickel version, because 586 is not blued but painted, it is a bit too shiny and looks rather unnatural. Besides I doubt that this coating is durable. UMAREX Smith & Wesson 586/686 comes with barrels of different length (4" (101,6 mm), 6" (152,4 mm) и 8" (203,2 mm)). If you know something about CO2 gun ballistics you understand why a 4” version is not very powerful (it will suit for plinking or fun), a 6” barrel is a bit more effective than average CO2 pistol. With an 8” barrel we can expect a good velocity and power, more flat trajectory and accuracy, so it will be good for small game hunting and pest control.

Construction of Smith & Wesson 586/686 allows changing barrel easily and quickly. You can buy 2.5", 4", 6" or 8" barrel and shrouds; a plastic wrench used for barrel replacement is included in the package. But we do not recommend changing barrels very often because a screw thread made of silumin tends wear out. A pistol has a quality steel barrel with 6 grooves.
A 10-shot rotary clip is made of aluminum alloy. It is one of the most disputable thing about 586/686. It isn't as long as a firearm cylinder and some people do not like it. Both versions have a black clip that looks very odd at a nickel 686. A pellet is fixed well in a chamber of a clip. Buying a gun check concentricity adherence of a clip and barrel (some UMAREX pistols has a slight defect of this unit that influence velocity and accuracy).

UMAREX Smith & Wesson 586/686 comes with metal front and rear sights, rear sights are adjustable for windage and elevation, it is a square notch similar to one of firearms though made of different materials. Eight-inch barrel separates the sights farther for more aiming precision, hence more accuracy. It is possible to use a dovetail rail for a scope or a red-dot sight instead of rear sight. Front sight is also removable; a black one can be replaced with an orange, blue or ivory sight for better aiming. You may also mount a rifle scope and a butt stock turning a pistol into some kind of a carbine.

A pistol works perfectly. If you want you your S & W to shoot better clean the gun after buying in order to remove factory conservation lubricant and then oil a pistol with gun oil. 586/686 shoots both in single-action and double action mode. Single-action trigger pull is good enough. Double-action trigger-pull is smoother and allows shooting more accurately. By the way this S & W shows a very good accuracy for a CO2 pistol. I got group less than one inch at 10 meters. It is the best result among all the other repeating air pistols.

The only serious drawback of UMAREX Smith & Wesson 586/686 is that many important components (for example a trigger, a hammer catch and a cock) are made of silumin. That is why a pistol that works like a dream at the beginning operates not so smoothly after 1000 shots and a trigger starts to play that irritates much. Though changing of worn detail will solve all the problems it is possible only in those countries where UMAREX has its service centers (US being among the lucky ones) otherwise it will be difficult to repair a pistol.

Smith & Wesson 586/686 is powered by 12gr. CO2 cylinders. A construction of CO2 unit is typical for UMAREX. One CO2 cylinder will be enough for 60 full-power shots at 73 o -77 o F. Further shooting is not effective because a trajectory of a projectile changes significantly from shot to shot. The first 40-50 shots are good enough for hunting. From 10th to 40 th shot a trajectory is almost absolutely stable (providing ambient temperature is constant). Accuracy is in direct proportion to barrel length. An 8” barrel shows perfect muzzle velocity and accuracy for this type of gun.
UMAREX Smith & Wesson 586/686 Specification
Barrel length 4” 6” 8”
Overall length 9.25” 11.22” 13.18”
Weight 2.49 lb 2.75 lb 3.08 lb
Caliber .177”
Ammo Lead pellets only
Powerplant 12-gr.CO2 cylinder

Sunday, September 13, 2009

Airgunstyle AirBlog: Types of Airguns

Airgunstyle AirBlog: Types of Airguns

Airgunstyle AirBlog: Choose Your Ammo Right

Airgunstyle AirBlog: Choose Your Ammo Right

Thursday, September 3, 2009

Choose Your Ammo Right



Choose Your Ammo Right

An Air Gun without pellets is not useful at all. You need pellets and should be very careful choosing them. Our site offers you hundreds of pellets of different calibers, shapes, sizes and weights. It is obvious, that the fist thing you should take into account choosing ammo is your Air Gun caliber.

There are several common calibers: .177 (4.5 mm), .20 (5mm), .22 (5.6 mm), .25 (6.35 mm), .35 (9mm), .45 (11.4 mm), .50 (12.7mm).
.177 (4.5 mm) caliber is the most popular one. Almost all the Air Guns for target shooting, plinking and small pest hunting, as well as all the guns used for ISSF shooting events have .177 caliber. It is the smallest caliber available. And the smaller caliber an Air Gun has the higher its velocity (other conditions being equal) and the more straight-line trajectory has a pellet. And this contributes better accuracy of .177 Air Guns.

.20 (5mm) stands in the middle between two popular ones (.177 and .22) and have features of the both. The trajectory of a .20 pellet is almost as flat as the trajectory of a .177 pellet. But its weight is close to the weight of a .22 pellet (this pellets usually have elongated shape). Thus a shot is much more powerful. .20 caliber Air Guns are not very common. They are made by a number of European manufacturers and Sheridan. It is a good general purpose caliber.

.22 (5.6 mm) is the most widespread caliber of hunting Air Guns. These Air Guns are powerful enough for hunting small game.

.25 (6.35 mm) is the largest caliber among the most popular ones. Because of its heavy weight .25 pellets are very powerful but for the same reason it has a parabolic trajectory especially at low energy. That is why .25 as any other large calibers are appropriate only for high power rifles.

.35 (approximately 9mm). The big bore calibers start at 9mm (.356). The most popular big bore rifles are made by Korean manufacturers, for example, Career 707 9mm Ultra and Career Fire 202S by Shinsung. 9mm Career Ultra can shoot only lightweight pellets and is good for hunting rabbits, woodchuck, raccoons and possum. Career Fire 202S suits for killing coyotes, fox, beaver, turkey and other animals from 25 to 50lb.

.45 (approximately 11.4 mm) rifles are even more powerful. Unlike other PCP rifles big bore have recoil. The examples of .45 rifles are single-shot Big Bore 909S and Big Bore 44 909 Light Hunter by Sam Yang. With 200-grain pellets a .45 rifle can take deer with a good close shot.

.50 (12.7mm) is the next caliber. As hunters say Big bore rifles suit for hunting game weighing 300 pounds or less. They may be used on larger animals, but it is rather risky. .50 caliber Dragon-Slayer makes it up to 200 foot-pounds and is capable to kill a whitetail deer.

But caliber is not the only thing you should take into account selecting the right ammo for your Air Gun. There is a great deal of various Air Gun pellet shapes. Flat Nosed pellets (or wadcutters) are designed for target shooting because they make accurate round holes in the target. Round Nosed pellets are used for everything else. They have better aerodynamics for longer distance shooting. Hollowpoint pellets are supposed to expand better, pointed pellets are supposed to penetrate better but have worse aerodynamics and there are lots of other shapes.

Airgunstyle.com offers you the largest selection of pellets of all possible shapes including Round Nosed, Hollowpoint, Wadcutter, Doomed etc. made by the best manufactures. A lot of shooters consider Crosman Premier pellets to be the most accurate and consistent pellets currently made. The .177 caliber pellets come in two weights, 7.9 and 10 grams.

The .20 and .22 pellets are very good as well. Target shooters should look at the Wadcutter pellets from RWS and HN, both of whom make Wadcutters in different weights and levels of quality. All of these pellets are available at airgunstyle.com. Besides Air Guns Pellets we offer a great deal of other Ammo: Air Soft BBs (6mm, 8mm, 0,43" Rubber for Paintball Markers and eco-friendly Biodegradable BBs), Steel BBs, Cleaning Pellets of various caliber, Blank Guns ammo, SlingShot Ammo (0,25"/0,30"/ 0,375"/0,50"), Darts and Broadheads.

Actually there are no more than three characteristics that you should pay attention to choosing pellets for Air Guns: size, consistency from pellet to pellet, and weight. Size implies not only choosing the proper caliber. Some pellets are undersized, which leads to blowby and reduced accuracy and can damage powerful spring Air Guns. Consistency means that each pellet will be just like the others. Consistency contributes accuracy.

Weight influences the transference of energy from the gun to the pellet. For every gun, there is a weight of pellet that will lead to the best transfer of energy, and produce the best accuracy. Spring guns are especially sensitive to pellet weight. Moreover, be sure to take into consideration whether or not your Air Gun is pellet specific, and what activity you'll need it for.

Experienced shooters say that the best way to choose a pellet is to try those which are used by the others, and use that as a place to start experimenting.

Wednesday, September 2, 2009

Types of Airguns


If you just have a look at the assortment of Airguns at AirGunStyle you will learn that Airguns come in many shapes and forms. Depending on the powerplant (means of pushing a pellet out the barrel) Airguns may be divided in three main groups: Spring-Piston Airguns, Pneumatic Airguns, CO2 Airguns.

Spring-Piston Airguns

Spring-Piston Airguns are the most popular ones because it is the most affordable type. Besides, Spring-Piston Airguns are easy to shoot and maintain.

Spring-Piston guns operate by means of a coiled steel spring-loaded piston contained within a compression chamber, and separate from the barrel. Cocking the gun causes the piston assembly to compress the spring until a small hook on the rear of the piston engages the sear, pulling the trigger releases the sear and allows the spring to decompress, pushing the piston forward, thereby compressing the air in the chamber directly behind the pellet. Spring guns, especially powerful ones, have great recoil that makes them less accurate.

The better quality spring air guns can have very long service lives, being simple to maintain and repair. But Spring-piston Airgun owners must be aware that one should not shoot this gun without a pellet in the breech. It may course serious damage. Besides, springs of Spring-piston Airguns do wear out after a while. A spring piston replacement is rather inexpensive and very easy for an air gunsmith.

There are several subcategories of Spring-Piston Airguns. The most widespread kind of them are single-shot breech-loaders. Nowadays multiple-shot guns are becoming very popular. Spring guns are usually cocked by a mechanism requiring the gun to be hinged at the mid-point (called a break barrel), with the barrel serving as a cocking lever. There are also side levers, under-barrel levers and electric cocking, powered by a rechargeable battery.

Pneumatic Airguns

Pneumatic Airguns use compressed air for power. The most common pneumatic Airgun is the Multi-Stroke (also referred to as Pump-up type pneumatic Airgun). To get a little volume of air compressed in a multi-stroke pneumatic takes, as the name implies, 2-10 strokes of the pump lever to get the internal pressure needed for shooting. As a rule multi-stroke pneumatic Airguns are not big, accurate, with low recoil, light weight and not very powerful. The main disadvantage of Multi-stroke pneumatics is effort needed for every shoot.

Single stroke
pneumatic Airguns seemed to be more interesting. It is enough to move the cocking lever only once to compress the air for a shot. The main merits of Single stroke pneumatic Airguns are consistency, accuracy and lack of recoil, demerit is low power.

Pre-charged pneumatic (PCP) Airguns are filled from an air tank, such as a scuba cylinder or by charging directly with a hand pump. Thus buying a PreCharged Rifle you have to buy cylinders or pump too. On the comparison with CO2 Airguns. PCP Airguns have higher initial costs but later operating costs become quite low. Powerful PreCharged Rifle is an excellent choice for those hunters who live in countries with strict firearms laws. PCP Airguns are also used in sport of Field Target shooting. PreCharged Rifles have very low recoil. You can make about 500 shots per charge. PreCharged Airguns are very widespread in the EC because of their accuracy and ease of shooting.

CO2 Airguns

CO2 Airguns
use compressed CO2 as the source of power. C02 is contained in special tanks. CO2 Airguns have much in common with PreCharged Airguns, but still there are some important differences. CO2 Guns have a simpler system for compact storage of energy: a small CO2 tank carries a large volume of pressurized gas. CO2 Airguns have no pressure regulator. Generally it makes CO2 guns construction to be simpler than PreCharged guns construction. At the same time liquid CO2 must be bought while a PCP Airgun with hand pump use free air. Moreover under the average conditions the pressure in CO2 reservoir is thrice lower than working pressure of an ordinary full PCP tank. That is why PreCharged Rifles are more efficient than CO2 Rifles.

CO2 guns as well as compressed PCP Airguns, have enough energy for repeated shots in a compact package without the need for complex cocking or filling mechanisms. Nowadays CO2 replicas of famous firearms are manufactured that became very popular among the collectors.

Air Guns History


As historians say the first Air Guns appeared in the 15th Century, when they seemed so mysterious that were called tools of the Devil.

At that time Air Guns were more preferable than black powder rifles for a number of reasons:

Air Guns could be fired in wet weather and rain (unlike matchlock muskets) and with greater rapidity than muzzle-loading guns;

They were quieter than a firearm of similar caliber, had no muzzle flash, and did not scare away all the rest of the game when hunting.

Air guns were completely smokeless, thus not disclosing the shooter's position.
They could be loaded faster than black powder guns.
Shooter did not have to worry about getting burned.
Air guns were very popular during the 1600s and 1700s until cartridge bullets were perfected. Although some enthusiasts love to talk about Air Guns posing a serious alternative to powder weapons, such was never proven to be the case. Yes, the potential is there, but valve leaks and bursting reservoir were known problems.
Early Air Guns came in big/small calibers and were used for hunting big game as well as small game. At that time there were calibers starting at .20 cal. and up to .50 caliber Air Guns.
Some of the earliest Air Guns were powered by spring loaded bellows. As a rule these low-powered and very accurate Air Guns were used for target shooting indoors. Another type of Air Guns powered by pre-compressed air stored in a tank was efficient enough to be used for hunting big game such as wild boar or stag. Only rich and noble men could afford possessing an Air Gun that became an attribute of their social status.
At the end of the 18th Century in Austrian Army there was a special sniper detachments armed with .44 caliber repeating air rifles designed by Grandoni. They did battle against Napoleon's Army. A shot from this air gun could penetrate a one-inch wooden board at a hundred paces, an effect roughly equal to that of a modern 9 mm or .45 caliber pistols.
The records of the Lewis and Clark expedition of 1804-1806 show they used the .36 caliber Air Gun. They took it along for hunting, just in case the black powder got wet and also used it to impress the Indians that called this rifle "the smokeless thunder stick".
There is one more interesting fact of Air Guns history. High class gentlemen used walking canes that had a concealed Air Gun in the cane. The top part of the cane was the air tank where the gentlemen charge it with the use of a hand pump. The bottom part was the barrel of the gun and had a concealed chamber for loading a .35 cal. bullet. These air canes were used for self defense.
After cartridge bullets were perfected and became popular the large boar caliber rifles started to fade away, smaller caliber spring piston rifles became popular for target shooting.
Today there has been a come back of high powered, large caliber Air Guns. After WW II the occupying Allies prohibited firearms production in Germany and many German factories turned to Air Gun manufacturing. Since that time German manufactures has become the leading ones and you can see a lot of their Air Guns at AirGunStyle.com.
Nowadays Air Guns are mainly used for target shooting and hunting. In some countries powerful Air Guns are still classified as firearms, and it may be illegal to discharge them in residential areas.

Air Gun Hunting





Hunters have been using Air Guns for hundreds of years. Early Air Guns came in both big and small calibers and were used for hunting big game as well as small game. At that time there were calibers starting at .30 cal. and up to .51 caliber Air Guns. Air Guns of the 16th Century powered by pre-compressed air stored in a tank were efficient enough to be used for hunting big game such as boar or deer.

Today Air Guns are mainly used for hunting small game. Large game Air Rifles are also popular especially in countries with strict firearms law. Recent efficient Air Guns suit for hunting all animals in the US and Canada. Power levels of contemporary large game Air Rifles have greatly exceeded the hunting capabilities of the earlier rifles. Currently, large bore Air Rifles are capable of generating about 200 ft•lbf (270 J) of energy with large bullets (200 grains (13 g) or more), making them capable of taking large game.

The main feature of a good Air Rifle for smaller game hunting is accuracy while power is only the second criteria. An over-sprung, wildly recoiling and inconsistent 20 foot-pound rifle that sprays Air Gun pellets all over the place (as a rule Air Gun ammunition is not designed for high power and tend to deform once they leave the barrel) does not bare comparison with less powerful Air Rifle that delivers its punch right on target every time. So, the first thing you should know is that in hunting efficient Air Rifle without consistent accuracy is absolutely useless. If you can't hit your target, no amount of super pellet energy or "penetration" is going to do you any good. Next most important is downrange energy.

Among more than hundred hunting Air Guns AirGunStyle store is glad to offer you every hunter is sure to choose the one that meets all his demands. Selecting hunting Air Gun do not forget that its characteristics should be in compliance with the kinds of game you are going to hunt. As specialists say birds require one-inch accuracy at 20 to 30 yards; squirrels require the same accuracy, but at least 8 ft. lbs. of energy at that distance. Crows require two-inch accuracy at 40 to 60 yards, the same as wild woodchucks, but the chucks require 10 to 15 ft. lbs. of energy at that range, while the crows – 7 ft. lbs.

Air Rifles may be used for pests control. The most widespread pests are house mouse, brown rat, that spread diseases, grey squirrel, that damage buildings, wood pigeons that can eat a tremendous amount of grain or cereal crop especially when there are large flocks of them, rabbits, that gnaw at the base of young trees which will kill them, foxes, that kill hens. For pest control both Air Rifles and Air Pistols are used.