CMMG 20" GP AR-15 Barrel Assembly 5.56mm 55D21E1

CMMG, Inc.
815835016818
55D21E1
ARR-118-095
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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, and front sight post. All barrel assemblies are properly headspaced.

Features and Specifications:
20"
Government Profile
4150 Chrome Moly Vanadium
Chrome Lined
Maganese Phosphate Coated
1:7 Twist
5.5645 NATO Chamber
Triangular handguard cap
Threaded 1/2-28
Rifle length gas port
.750" Gas Journal
F Marked Front Sight Base