RCM is releasing a Brand New Barrel for the Pre-G3 HK M/61 Parts Kits that are now available. This Cold Hammer Forged Barrel is made from a Mil-Spec 41v50 Blank,  1:10 Twist, 17.700 long, Nitride inside out. These barrels are top of the line.  7.62 Nato Chambers with 12 flutes. Not another barrel out there even comes close to this.