Proof Research Prefit Barrel Mini Fix 300 12" – Carbon Fiber Drop-In Replacement

The Proof Research Prefit Barrel for the Mini Fix platform delivers match-grade accuracy in a compact 12-inch configuration chambered in 300 BLK. This barrel uses Proof's proprietary carbon fiber wrap over a precision-rifled stainless steel core, reducing weight while maintaining rigidity and heat dissipation for extended shooting sessions.

Designed as a drop-in replacement for the Q Mini Fix receiver, this prefit barrel requires no gunsmithing for installation. The carbon fiber construction offers significant weight savings over traditional steel barrels without sacrificing durability or precision. Threaded muzzle accepts standard 5/8x24 TPI muzzle devices and suppressors.

• Type: Prefit barrel assembly
• Compatible Firearms: Q Mini Fix platform
• Chambering: 300 BLK
• Length: 12 inches
• Construction: Carbon fiber wrapped stainless steel
• Thread Pitch: 5/8x24 TPI
• Use: Direct replacement barrel for Mini Fix, SBR builds, suppressed applications