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Aero Precision - M4E1 No Forward Assist Assembled Upper Receiver - 16" Barrel - .223/5.56 - APAR612218M7
Colt LE6920CK Upper Receiver Conversion Kit .223/5.56 NATO 16.1" Bl
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
Ballistic Advantage Performance Series AR-15 11.3" 5.56x45mm Carbine Length Hanson Barrel with Low Profile Gas Bloc
Wilson Combat TR556SBRCG11RT7 Match Grade Barrel 5.56x45mm NATO 11.3" AR-15 416R Stainless Steel Bead Blasted
FN 36422 AR-15 Hammer-Forged Barrel 223/5.56 16" Mid Length Gas System
CMMG Barrel Sub-Assembly 55D590A 16.1" 5.56 NATO 416R Stainless Bead Blasted Finish AR-15 Compatible
Q LLC Sugar Weasel Upper AR-15 5.56 NATO 13" Barrel FDE Finish ACC-SW-556-13IN-UPPER