Abstract: Semi-automatic rifle including a free floating barrel with a muzzle located at a distal end and an engagement mechanism at a proximal end. The barrel has a length measured from the proximal end to the distal end. A receiver can be configured to couple the engagement mechanism of the barrel and a bolt at least partially rotatably mounted relative to the receiver. A gas cylinder system being coupled to the barrel substantially close to the muzzle and including an operating rod. A trigger assembly coupled to the receiver to receive at least a portion of the operating rod and a bridge coupled to the trigger assembly. A fire control located substantially within the trigger assembly and configured to actuate the bolt so as to eject a cartridge and load a subsequent cartridge from a clip.