Perfect for building your custom AR-15 upper group. Comes with properly installed M4 barrel extension, barrel nut, hand guard cap, pinned “F” marked front sight base, sling loop, front sight post, and Pinned and welded Extended A2 Flash Hider. All barrel assemblies are properly headspaced.

Features and Specifications:
Manufacturer Number: 55D9C85
14.5", 16" with Pinned and Welded Extended A2 Flash Hider
M4 Profile
4150 Chrome Moly Vanadium
Chrome Lined
Maganese Phosphate Coated
1:7 Twist
5.56×45 NATO Chamber
Threaded 1/2-28
Carbine length gas port
.750" Gas Journal
“F” Marked Front Sight Base