This MkG GUARD Upper Assembly is the optimal platform if you are looking to build your own custom Raidal Delayed Blowback GUARD Upper. The ejection port has been modified to reliably eject casings from 9mm to 45acp. It will also work great if you are looking to just build your own custom Pistol Caliber Carbine. The ejection port cover and forward assist come pre-installed to save you a little time on your build.
Our MkG Uppers are designed to work exclusively with our MkG Lowers. Other manufacturers lowers may work, but we cannot guarantee function or reliability.