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Daniel Defense 16" 5.56 NATO Govt Profile Barrel 0707709173018 Black Phosphate AR-15 Chrome Moly Vanadium
FN 36424 AR-15 Hammer-Forged Barrel 223/5.56 20" Rifle Length Gas System
FN 36423 AR-15 Hammer-Forged Barrel 223/5.56 18" Rifle Length Gas System
Colt LE6920CK Upper Receiver Conversion Kit .223/5.56 NATO 16.1" Bl
FN 36422 AR-15 Hammer-Forged Barrel 223/5.56 16" Mid Length Gas System
Ballistic Advantage Performance Series 14.5" 5.56x45mm Hanson Mid-Length AR-15 Barrel with Low Profile Gas Block -
CMMG Barrel Sub-Assembly 55D590A 16.1" 5.56 NATO 416R Stainless Bead Blasted Finish AR-15 Compatible
Ballistic Advantage Performance Series AR-15 11.3" 5.56x45mm Carbine Length Hanson Barrel with Low Profile Gas Bloc
CMMG Barrel Sub-Assembly 55DC70A 16.1" 5.56 NATO 4140 Chromoly Nitride AR-15 Compatible
Aero Precision - M4E1 No Forward Assist Assembled Upper Receiver - 16" Barrel - .223/5.56 - APAR612218M7
Q LLC Sugar Weasel Upper AR-15 5.56 NATO 13" Barrel FDE Finish ACC-SW-556-13IN-UPPER
Wolf Performance A1 Complete Upper 12.5" 5.56 NATO 1:7 Piston Driven
Rosco Manufacturing K9 13.95" 5.56 NATO 416R Stainless Nitride Barrel for AR-15