Mission First Tactical AR-15 5.56x45mm Rifle Magazine Coupler Black. It is made of high-impact superior-grade lightweight polymer and will not scratch or deform magazines. Easy to assemble two-bolt design will keeps your mags in place even through the toughest conditions. Slimmer mags will require the use of the included wedge (pictured as D). Thicker Mags will not require the wedge. Specifications for Mission First Tactical AR-15 5.56x45mm Rifle Magazine Coupler: Manufacturer: Mission First Tactical Gun Model: AR-15 Condition: New Color: Black Features of Mission First Tactical AR-15 5.56x45mm Rifle Magazine Coupler: Size of coupler is congruous with all popular magazines. Fast and efficient ammunition reloads Two-bolt design secures the magazines in an easy-to-change assembly Advanced yet simple design utilizes ribbing for added strength. Easily fits all 5.56x45 Aluminum and Steel Mags all MFT mags 30 and 40 rd AR/M4 GEN M2 MOE and AR/M4 GEN M3 magazines Package Contents: Mission First Tactical AR-15 5.56x45mm Rifle Magazine Coupler What firearm models does the manufacturer say Mission First Tactical AR-15 5.56x45mm Rifle Magazine Coupler is compatible with? The manufacturer suggests that Mission First Tactical AR-15 5.56x45mm Rifle Magazine Coupler is compatible with AR-15Mission First Tactical PM556-MC-1: AR-15 5.56x45mm Rifle Magazine Coupler Black