12.5 inch 350 LEGEND AR-15 Barrel, 4150 CMV and Nitrided, 1/16 Twist, Medium Contour Barrel Profile with Pistol length Gas System - made by Tactical Kinetics. Our Tactical Kinetics AR platform barrels are constructed from the finest domestically sourced steels, are drilled, reamed, and button rifled, and then profiled and chambered to exacting dimensions in compliance with SAAMI Specifications. Our high-precision manufacturing processes ensure both accurate and repeatable performance for thousands of rounds. Weight 1 Length 12.5 Profile Medium Twist 1:16 Finish Nitride Material 4150 CMV Thread Pitch 5/8-24 Caliber 350 LEGEND Feed Ramp M4 Flutes N/A Gas System Pistol Rifling Conventional Gas Block System 0.750 **NOTE** Do NOT use standard 5/8-24 muzzle devices for 30 cal. Only 5/8-24 muzzle devices specifically for 350 Legend or larger can be used.