F LBE Unlimited 10.5" 5.56 M4 1:7 Twist Black Nitride Carbine Barrel $155.95 ARBAR7-10 show more like this $8.99 Flat Rate or FREE over $175 AR15Discounts F LBE Unlimited 10.5″ 5.56 M4 1:7 Twist Black Nitride Carbine Barrel $155.95 ARBAR7-10 show more like this $8.99 Flat Rate Dirty Bird Industries