The KATRAN series has several variations. The KATRAN SC, KATRAN C, KATRAN (Standard), KATRAN L and KATRAN X (slug version of the KATRAN). Each of These Versions has an air cylinder or carbon fiber bottle option.   It has an ergonomic right-hand AR15 grip, a folding stock with adjustable butt-pad and cheek-piece. The aluminum foregrip has a 9 slot Keymod for accessory mounting. The side-cocking lever is a very smooth, short stroke and is located right by the trigger. It can be switched to either side of the gun. It's a 2-stage trigger . The KATRAN is also equipped with an anti-double feed system (.22 and .25 only)