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AR-15 16" M4 Contour Barrel, 5.56 NATO, 1:9, Black Nitride
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AR-15 10.5" M4 Contour Barrel, 5.56 NATO, 1:7, Parkerized
AR-15 16" M4 Contour Barrel, 5.56 NATO, 1:8 Twist, Black Nitride
5.56 NATO 14.5" Parkerized M4 Barrel - 1:7 Twist - Carbine Length Gas System
Aero Precision AR15 Complete Upper, 16" 5.56 M4 Barrel with 15" M-LOK ATLAS R-ONE Handguard - Anodized Black -