Proof Research Prefit Barrel Mini Fix 300 BLK 16" – Carbon Fiber Match Grade

The Proof Research Prefit Barrel for the Mini Fix is a drop-in replacement barrel chambered in 300 BLK with a 16-inch length. Built with Proof's carbon fiber-wrapped construction, this barrel combines match-grade accuracy with significant weight savings compared to traditional steel barrels. The prefit design allows installation without gunsmithing on compatible Mini Fix receivers.

This barrel features a steel core wrapped in aerospace-grade carbon fiber, delivering consistent accuracy while reducing barrel harmonics and heat buildup. Threaded muzzle accommodates suppressors and muzzle devices. Compatible with Mini Fix platforms chambered in 300 BLK. Barrel only — does not include gas block, muzzle device, or installation hardware.

• Type: Prefit rifle barrel
• Chambering: 300 BLK
• Length: 16 inches
• Construction: Carbon fiber-wrapped match-grade steel
• Compatible Platform: Mini Fix receivers
• Thread: Standard 5/8x24 (verify compatibility)
• Includes: Barrel only
• Use: Precision rifle builds, suppressed setups, weight reduction upgrades