Phase 5 WSI Complete Upper Receivers are built for performance and reliability with innovative components to function no matter the situation. Every upper receiver is assembled on-site, with the same attention to detail we would give our personal weapon systems. When failure is not an option, you can trust that your Phase 5 Complete Upper Receiver will not let you down.
Upper Receiver: A3 Forged 7075 T6 aluminum
Barrel: ROSCO M4 Profile 14.5", 1:7 Twist Rate, 4150 CMV, 1/2 x 28 TPI
Caliber: 5.56 NATO
BCG: AR15, Black Phosphate finish, Chrome Lined
Rail: LPSN15-MLOK
Muzzle Device: FlashCan-1/2-28
Gas Block: .750 Lo Profile Clamp Style
Gas System: MID Length
Charging Handle: DLCH15
Limited Lifetime Warranty