The JTS Group M12AR is a gas piston style semi automatic shotgun designed to conform to an AK style platform sharing the ergonomics and aesthetics. This particular model features an 18.7" chrome lined barrel that is threaded for Rem chokes. The 3" chamber is compatible with both 3" and 2-3/4" shotshells. The 4 position gas system features adjustments should you need to make a change for a specific picky or light load. It runs off of a detachable box magazine and comes standard with polymer synthetic furniture. This version does come with an aluminum forearm which features M-LOK modular attachment points. - CHAMBER 12GA 3" - MAGAZINE 5rd capacity - CHOKE Cylinder only (Rem Choke Compatible) - HANDGUARD Aluminum Forearm with M-LOK - STOCK Fixed Polymer Synthetic Stock