ProMag AR-15 M-16 Mag Quick Change Adapter Block 9mm Gauges The polycarbonate tip is vital

The polycarbonate tip is vital to getting proper expansion

Roof rack type carrier

-Fits 1911s

Carbon Cuff Diameter (C): 3

Reinforced Feed Lips

ProMag AR-15 M-16 Mag Quick Change Adapter Block 9mm Gauges The polycarbonate tip is vitalThe ProMag AR 15 M16 Magazine Quick Change Adapter Block 9mm is a 9mm magazine adapter block that installs in AR 15 lower receivers. It allows the use of 9mm Colt and SMG type magazines with 9mm upper receivers and is made of high strength polymer with steel hardware, roller, ejector, and bolt stop. The installation is quick without the need to remove the bolt stop roll pin. It is also made in the USA. 9mm magazine adaptor block Installs in AR 15