The Proof Research Proof Steel Drop In Barrel For Rifle Gas System AR-15 Compatible Firearms 223 Wylde 18" 1:7 Twist 1/2-28 is built to deliver consistent accuracy and smooth operation in the AR-15 platform. This traditional steel barrel uses Proof’s Caliber Matched Gas System (CAMGAS), tuning the rifle-length gas system to the 223 Wylde chamber and 18-inch length for a softer recoil impulse and cleaner cycling. The stainless finish and carefully profiled contour provide a balance of rigidity and manageable weight for serious shooters.

This barrel is ideal for range use, training, and precision-focused shooting where reliability and repeatable performance matter. The 1:7 twist rate stabilizes a wide range of modern .223/5.56 projectiles, while the 1/2x28 threaded muzzle makes it ready for brakes, compensators, or suppressor mounts. Designed as a drop-in upgrade for AR-15 compatible receivers, it offers an easy path to improved performance backed by Proof Research’s reputation for meticulous engineering and barrel craftsmanship.

Key Features:

• Manufacturer: Proof Research
• Model: 101636
• Caliber: 223 Wylde
• Barrel Length: 18"
• Twist Rate: 1:7
• Gas System: Rifle Length
• Threaded Barrel: 1/2x28 Muzzle Threads
• Weight: 3.15 lbs