F Helix 6 Precision Carbon Fiber 18in 6mm ARC Rifle+1 Rifle Barrel, 243cal, 0.75GB, 1-7 Twist, 5/8-24, Black, AR-6ARC7-18R1 $1,129.99 AR6ARC718R1 show more like this Dvor F Helix 6 Precision Carbon Fiber 18in 6mm ARC Rifle+1 Rifle Barrel, 243cal, 0.75GB, 1-7 Twist, 5/8-24, Black, AR-6ARC7-18R1 $1,129.99 AR6ARC718R1 show more like this Free Shipping on most orders over $49 Optics Planet