Seekins Precision barrels live up to the company's name. Precision CNC machined to match grade specifications from the best quality 416 stainless steel blanks available, each barrel is inspected no less than four times to guarantee maximum accuracy and reliability. Perfect for building an AR pistol or short barreled rifle, Seekins Precision barrels are built to match grade tolerances. Premium stainless steel blanks are precision machined and inspected to guarantee perfect concentricity and alignment for maximum accuracy potential. Each barrel has a non-glare bead blast finish which is then ArmorBlak coated and threaded for applicable muzzle devices. Threads for .300 AAC Blackout are 5/8-24. 5R button rifling and 1:7 twist. Made as a drop in replacement barrel for any mil-spec upper receiver. The .300 AAC Blackout chamber takes advantage of .300 AAC Blackout accuracy while still able to safely and accurately shoot the higher pressure ammunition. The 10.5" barrels use a pi...