The Stoner Rifle 15 (SR15) series are semi-automatic rifles featuring 16" chrome chamber barrel, a URX free floating barrel system, ambi control system, 2 stage trigger, improved multi lugged E3 bolt and integral front sight and sling mounts. this is a comprehensive package and does not require excessive modular accessories for performance enhancements. the KAC SR-15 is the first rifle model with an integrated Weapons System (IWS) that combines both built-in and modular features.