The Rosco Manufacturing PB-145-SPR-6MM-7.5-I Purebred 6mm ARC 14.50" Nickel Boron Stainless Steel Barrel is purpose-built to get the most out of the 6mm ARC cartridge. Crafted from 416R stainless steel with an SPR profile and bead-blasted nickel boron finish, this 14.5" threaded barrel is optimized for precision, consistency, and smooth integration on AR-15 platforms.

This Purebred barrel uses an intermediate gas system tuned around popular precision bullet weights and suppressor use, helping deliver stable gas flow and reliable cycling. The SPR contour balances rigidity and weight for repeatable cold-bore hits and extended range sessions. Ideal for precision-focused range work, training, and hunting applications where accuracy and consistency matter, this barrel reflects Rosco Manufacturing’s reputation for careful machining and quality-driven barrel design.

Key Features:

• Manufacturer: Rosco Manufacturing
• Model: Purebred PB-145-SPR-6MM-7.5-I
• Caliber: 6mm ARC
• Condition: New
• Barrel Length: 14.5"
• Threaded Barrel: 5/8"x24
• Gas System: Intermediate Gas System
• Material: 416R Stainless Steel
• Twist Rate: 1:7.5"
• Barrel Profile: SPR
• Finish Color: Nickel Boron Matte / Bead Blasted Stainless
• Platform: AR-15
• Weight: 32.3 oz