This MPCRF semiautomatic has a gas impingement system with a manual safety lever and indicator markings on both sides of the receiver. The M4A4type flat top upper receiver is made of forged 7075 T6 aircraft aluminum with an aluminum trigger guard and a hard coat black anodize finish. The 16 barrel is made of chromelined 4150 chrome moly vanadium steel with an M4 profile and A2 flash suppressor. It has a 6position telescoping buttstock with M4 Double Heat Shield hand guards and a black plastic grip. It has an adjustableheight square post in a standard A2 front sight base and this RF model MPC rifle features a removable Diamond head rear flip sight."