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 7.5", 1:7 Twist Rate, 4150 CMV, 1/2 x 28 TPI

Caliber: 5.56 NATO

BCG: AR15, Black Phosphate finish, Chrome Lined

Rail: LPSNx7.5

Muzzle Device: littleBOY556

Gas Block: .750 Lo Profile Clamp Style

Gas System: Pistol Length

Charging Handle: DLCH15