] Common carbines include the  LWRC PSD Rifle ,  Colt CAR-15   [ 10 ] [ 11 ] [ 16 ] [ 17 ]  resp.  M4 [ 11 ] [ 12 ] [ 14 ] [ 19 ] [ clarification needed ]  and  Heckler & Koch G36 [ 18 ]  resp.  HK416 .