ATI 9MM AR-15 Adapter 5.56 Lower Receiver 10 Rd Mag

American Tactical Imports lets you convert your AR lower to accept 9mm GLOCK magazines and use a 9mm upper to shoot 9mm out of your AR. Use your regular AR in a PCC class or just save on ammo shooting 9mm instead of 223. These savings can quickly pay for the conversion parts and let you have fun at the same time. This is a plug and plays conversion for your AR lower.