Engineered for high-volume shooting and extra durability, TR Imports’ Tac Pro includes enhanced features: all-metal construction; quick 2-pin take down; rear-mounted buffer spring for reliable cycling at high temperatures; unique hybrid gas/inertial action for reliable cycling with a wide range of loads and under heavy use. Adjustable, flip up front and rear sights; quad Picatinny rail; adjustable comb; sling attachment points. Barrel is threaded for Beretta Mobile Chokes