F Rosco Bloodline 16 in M4 5.56 NATO Mid-Length Barrel $140.50 BL-16-GVT-556-7-M - $24.99 Handguns / $39.99 Long Guns Firearms Depot F Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-GVT-556-7-M $152.10 BL16GVT5567M - Free Shipping on most orders over $49 Optics Planet F Rosco Bloodline Barrel AR-15 5.56x45mm 16 Mid Length Gas Port USASOC Contour 1 in 7" Twist 1/2"-28 Thread Nitride - 488996" $152.10 BL-16-GVT-556-7-M - 10.75 MidwayUSA F Rosco Manufacturing Bloodline 5.56 NATO Barrel, M4, 16in, Mid Length, 1-7 Twist, 1/2x28 Thread, Nitride, Black, BL-16-GVT-556-7-M $152.10 BL16GVT5567M - Dvor