Our employees unanimously agree that this is one of the best grenade shells we've ever carried. It does not require "resetting" like the other shells on the market, just fill it with gas like a magazine and fill it with BBs and you're ready to go. If it does need a reset, simply push the back button in all the way to reset (very easy) the gas seals. Whether you want it for blasting people in CQB, or want a wall of BBs at 100+ ft., this CNC (computer numerical controlled) made aluminum grenade will do job. And, because it's shorter than most shells, it will fit nearly any airsoft grenade launcher on the market.