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328fps is 100m/s, and a 0.2g bb travelling at this speed possess the energy of exactly 1 Joule.

Energy (in joules) = 1/2 mass * velocity^2

FPS is the most common way of measuring the velocity of an airsoft gun. The average FPS rating is 250 for lower end guns and 300-500 for higher end guns. Sniper rifles vary from 350 up to 600 fps.

Most high end guns shoot at an average of 1 Joule kinetic energy. However, most chinese MPEG shoot around 400 FPS. This is because they are marketing to new players, who consider FPS to be very important. However, high end guns, even with lower FPS are of much higher quality. DO NOT buy a gun just because of its high FPS. The average LPEG shoots under 220 FPS, and minis usually shoot 115 FPS. Springers have various FPS merits . Small spring pistols seldom get above 250, while snipers, as stated above, shoot up to 600. Gas powered guns usually have higher FPS than other guns of their type, but use a different propulsion method. 145 FPS is about 100 miles per hour.

The FPS listed on websites selling airsoft guns is the FPS measured with a standard .2g bb. Heavier bbs will decrease the FPS, but increase the amount of kinetic energy the bb has in flight, thus increasing the hitting power and accuracy. There is no known sure formula for how FPS is effected by BB weight, so it must simply be tested in each gun.

FPS is measured by Chronographs, which are similar to a police officer's radar guns, in the way that they measure the speed of an object moving past it. These can be bought for as low a sixty dollars.

UK FPS Limits Edit

In the UK the standard FPS limit for an AEG or GBB Rifle is 350fps with snipers coming in at 500 fps with a minimum engagment range of about 25 meters. These do vary from site to site but this is the general rule of thumb.

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