External Selector Switch Version! Our M4 / M16 Magazine Kit Is the Perfect Modification for A-5 Owners. The Placement of this magazine is set close to the trigger guard giving it the most authentic M4 / M16 Magazine look on the market. This magazine is made of a high grade polymer that will not weigh you down yet maintains strength and toughness. It also features the LAPCO logo in the same placement of authentic M4 / M16 magazines. We dare you to find a better quallity kit that's as affordable as ours.