This full metal 40mm grenade shell is used with a 40mm airsoft grenade launchers such as the M203 or MGL. This longer-length shell holds 90 rounds and the shell is gas powered. The BBs are loaded into the large center opening and sealed with a reusable rubber plug. When fired, the BBs fly out in a shotgun-patterned scatter shot. This shell is loud and powerful, perfect for room clearing and suppression, and is sure to intimidate the opposing force.