This Raven MEU 1911 magazine holds up to 22 rounds, The magazine is filled with 6mm Airsoft BBs from either the front or the top by hand or by using an Airsoft Speed Loader. The Magazine is filled with standard Airsoft Green Gas Bottles by the inlet valve at the bottom of the Magazine. This magazine is a must have for those who own a Raven MEU 1911 Pistol.