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BCA 5.56 NATO, 7.5" Parkerized M4 Barrel, 1:7 Twist, Pistol Length Gas System Diamondback Firearms 5.56 AR-15 Carbine Barrel Nitride - 10" BCA 5.56 NATO, 10.5" Parkerized M4 Barrel, 1:7 Twist, Carbine Length Gas System

 

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Diamondback Firearms 5.56 AR-15 Mid-Length Barrel Nitride - 16" BCA 5.56 NATO, 16" Parkerized M4 Barrel, 1:8 Twist, Carbine Length Gas System Ballistic Advantage Modern Series 5.56 Barrel 10.5" Gov. Profile
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Ballistic Advantage Modern Series 16" 5.56 NATO M4 Contour 1:7 Nitride AR-15 Barrel - Carbine - 1/2x28 Ballistic Advantage Modern Series 16" 5.56 NATO Government Contour 1:7 Nitride AR-15 Barrel - Mid-Length - 1/2x28
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