14.5" 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 14.5", 1:7 Twist Rate, 4150 CMV, 1/2 x 28 TPI

Caliber: 5.56 NATO

BCG: AR15, Black Phosphate finish, Chrome Lined


Muzzle Device: FlashCan-1/2-28

Gas Block: .750 Lo Profile Clamp Style

Gas System: MID Length

Charging Handle: DLCH15

Limited Lifetime Warranty

Prop 65 Warning

In stock
Item Price: $829.99
Barrel Length:
14.5 in
5.56 NATO
Overall Length:
24 in
Assembled Weight:
4.35 lbs
Made in the U.S.A.


Phase 5 A3 UPPER

Phase 5 LPSN15-MLOK

Phase 5 BCG-AR15

Phase 5 DLCH15

Dual Latch Charging Handle

Phase 5 FlashCan - Pinned and Welded

Phase 5 Gas Block (Clamp Style Mounting)

ROSCO Barrels Bloodline 14.5"

5.56NATO M4 Profile - MID Length Gas System