The Rosco Manufacturing PB-20-SPR-6MM-7.5-R1 Purebred 6mm ARC 20" Nickel Boron Stainless Steel Barrel is purpose-built to get the most out of the 6mm ARC cartridge. Its 20 inch SPR contour balances stiffness and weight, while the 416R stainless steel construction and nickel boron–treated extension support consistent accuracy and long service life. A Rifle +1 gas system and carefully sized gas ports are tuned around popular precision bullet weights and suppressor use.

This Purebred 6mm ARC barrel is well suited for precision-focused AR-15 builds where reliable cold-bore performance and smooth cycling matter. The extended Rifle +1 gas system helps soften recoil impulse, making it a strong choice for extended range sessions, practical competition, or varmint and medium-game hunting within the 6mm ARC’s envelope. Rosco Manufacturing’s attention to detail and in-house craftsmanship result in a barrel that serious shooters can trust shot after shot.

Key Features:

• Manufacturer: Rosco Manufacturing
• Model: Purebred PB-20-SPR-6MM-7.5-R1
• Caliber: 6mm ARC
• Barrel Length: 20"
• Rate Of Twist: 1:7.5"
• Gas System: Rifle +1
• Material: 416R Stainless Steel
• Finish: Nickel Boron Barrel Extension / Matte Stainless Barrel
• Product Type: Barrel