The Sons of Liberty Gun Works 16" Precision SPR Barrel Chambered in 6mm ARC is a standalone rifle component optimized for long-range performance. Machined from 416R stainless steel, it features a specialized SPR contour and 3-groove polygonal rifling to enhance projectile velocity and reduce bore fouling. The mid-length gas system is specifically tuned to provide a smooth cycling impulse and reliable operation with 6mm ARC pressure curves. It is finished in a durable black oxide and includes a 1:8 twist rate to stabilize common match-grade 6mm projectiles. Sons of Liberty Gun Works Precision SPR 6mm ARC 16" 1:8 5/8x24 Muzzle Thread Midlength 416R Stainless Barrel 16Precision-SPR-6ARC