This is based on a SKS receiver in an aluminum modular chassis. It features flat top picatinny with keymod slots at 3, 6 & 9 o'clock. It accepts XCR-L magazines and features ambidextrous AR15 style magazine release. Barrel has been threaded & cut to 18.5" in length. It also comes with AR15 pistol grip and M4 buttstock. This rifle is lighter than a SKS by half a pound.