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Aero Precision M4E1 Threaded Complete Upper, 14.5" 5.56 Carbine Length Barrel, 12" M-LOK ATLAS S-ONE Handguard
FightLite Industries MCR556DFRM AR-15 Upper 5.56x45mm NATO 16.25" Black 7075-T6 Aluminum M-LOK Handguard
Aero Precision M4E1 Threaded 16" 5.56x45mm Mid-Length Complete Upper Receiver with ATALS S-ONE Handguard - Kodiak B
Aero Precision M4E1 Enhanced Gas Piston Complete Upper with 14.5" 5.56 Mid-Length Barrel & 12.7" Enhanced
Spikes Tactical Midlength Complete 5.56x45mm NATO 16", Black, 12" Picatinny Handguard, A2 Flash Hider
Aero Precision M4E1 Enhanced Gas Piston Complete Upper with 16" 5.56 M4 Carbine Length Barrel & 15" Enhanc
Aero Precision M4E1 Threaded Complete Upper, 16" 5.56 M4 Barrel, 15" M-LOK ATLAS S-ONE Handguard - Anodized Bl
FightLite Industries MCR060 Dual-Feed AR-15/M16 Upper 5.56x45mm NATO 16.25" Black
Fightlite Industries MCR-556-DFR 5.56 NATO 16.25" Upper Receiver Assembly
Aero Precision M4E1 Enhanced 14.5" 5.56 M4 Carbine Length Barrel Complete Upper Receiver - Anodized Black - APAR640
Rosco Manufacturing Bloodline 5.56 NATO 14.5" Nitride Barrel - BL-145-GVT-556-7-M
Rosco Manufacturing Bloodline BL-16-M4-556-7-C 16" 5.56 NATO Nitride 4150 CMV Barrel for AR-15 M4
Rosco Manufacturing Bloodline BL-16-HB-556-7-C 16" 5.56 NATO Heavy Barrel Nitride 4150 CMV for AR-15
DPMS Panther Arms Kitty Kat 5.56 NATO 7.5" Upper Receiver Black Nitride
Lead & Steel LS556PEN-MID-16 16" 5.56mm Pencil Profile 4150 CMV QPQ Nitride Mid-Length AR-15 Barrel