This Nuprol/MEU 1911 magazine is constructed entirely from Alloy, with the only Polymer parts being the Feed Lips and BB guide. The magazine is single stacked, and holds up to 21 rounds. The magazine is a perfect spare or replacement for the standard magazine which comes with Nuprol/MEU 1911 Pistol, and is great for those Airsoft Skirmishers who want to spend more time in-game before having to stop and reload all their magazines. This is a must have purchase for any Airsoft Skirmisher who runs a Pistol Only CQB loadout, allowing you to fire for longer, and carry more rounds.