The Anderson Manufacturing AM15 M4 is a semi-automatic rifle chambered in 5.56 NATO. The Magpul MOE stock is collapsible and the AM15 Keymod is also equipped with a full length picatinny rail allowing users to mount their choice of optics. This rifle is proudly made right here in the United States of America. Semi Auto - Caliber 223REM5.56 - Capacity 30 - Finish Black wRF85 Treatment - StockGrip A2 - Receiver Forged 7075-T6 - Forearm A2 Plastic Hand Guard - Flash Hider A2 - Twist 1-8 - Barrel Length 16", M4 Contour - Overall Length 32.5" - 36.1" - Weight 6.2 lb.