RandomTrashy checks out the TRMR E1 Impact Grenade that can be used in airsoft or milsim events, provided that your local site allows for it... "The T.R.M.R. is an ergonomically designed reloadable device that utilises a twist to arm inertia recoil firing system. This allow for safe, fast reloading of the device without the need for levers and pins as used on conventional hand deployed devices."