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AR-15 16" Hammer Forged M4 Barrel, 5.56x45mm, 1:8, Carbine Length, Black Nitride
AR-15 16" M4 Contour Barrel, .223 WYLDE, 1:8, Stainless
AR-15 16" M4 Contour Barrel, 6.5 Grendel Type 2, 1:8, Stainless
Bushmaster M4 Patrolman's Upper AR-15 5.56x45mm NATO 16" Barrel Black Nitride Finish
Bushmaster XM-15 Complete 5.56x45mm Upper Receiver 16" Barrel - 00-400003-BLK
Aero Precision - M4E1 No Forward Assist Assembled Upper Receiver - 16" Barrel - .223/5.56 - APAR612218M7
Aero Precision AR15 Complete Upper, 16" 5.56 M4 Barrel with 15" M-LOK ATLAS R-ONE Handguard - Anodized Black -
Aero Precision AR15 16" 5.56 Carbine-Length M4 CHM/PH Barrel Complete Upper 13" Slimline Handguard Left Handed
Rosco Manufacturing Bloodline 5.56 NATO 14.5" Nitride Barrel - BL-145-M4-556-7-C
Rosco Manufacturing Bloodline BL-16-M4-556-7-C 16" 5.56 NATO Nitride 4150 CMV Barrel for AR-15 M4