Centurion Arms CM4 Forged 5.56 Stripped Thermal Fit AR-15 Upper Receiver

Centurion Arms AR-15 CM4 Forged 5.56 Stripped Thermal Fit Upper Receiver Centurion Arms forged upper receivers are a great complement to their forged lower receivers. The thermal fit inner dimension measures at .997 -0.0/+0.001" and requires the application of heat to provide a solid mate to the recommended barrel extension. By heat, we mean more than Granny's hair dryer. Features For Use with M4 Barrel extensions Assembled Upper Receivers come with an ejection port cover and a forward assist installed Made in America on American-made machines *** Centurion Arms recommends gunsmith installation for all of their parts and cannot warranty items damaged by improper installation.***