16" 5.56MM AR15 Upper Receiver - MLOK

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 16", 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: FATman556

Gas Block: .750 Lo Profile Clamp Style

Gas System: MID Length

Charging Handle: DLCH15

Limited Lifetime Warranty

Prop 65 Warning