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TacFire BU45ACP16 45 ACP 16" AR-Platform Complete Upper Receiver Black Nitride
TacFire BU-45ACP-7 Pistol Upper Assembly AR-Platform 45 ACP 7" Black Nitride
Aero Precision M4E1 Threaded 20" .350 Legend Carbine Length Complete Upper Receiver with 16.6" ATLAS R-ONE Ha
Aero Precision M4E1 Threaded 16" .350 Legend Carbine Length Complete Upper with 15" ATLAS R-ONE Handguard - An
Rock River Arms SOC0820V1 LAR-15M CLB Complete Upper, 458 Socom 16" Chome Moly Bull Barrel, Black, Aluminum Rec, 13
CMMG Replacement Barrel Kit 22D7C4A, 16.10" 22 LR, 4140 Chromoly Steel Black Nitride, Fits AR-15/Mk4.
CMMG 22D5B6E Replacement Barrel Kit with Bolt Carrier Group, 22 LR 4.50" Threaded, Black Nitride Chromoly Steel, Fi
TacFire BU45ACP4 AR-15 Upper, .45 ACP, 4" Barrel, Black Finish
TacFire BU45ACP10 45 ACP 10" Black Nitride Barrel
Stern Defense 00645ACPBARREL105INCHD 10.5" 45 ACP Barrel Black Melonite 4150 CM Steel AR-15 Compatible