Specifications: Caliber: 5.56 NATO Action: Gas Piston Semi-auto Operating System: Closed rotating bolt long stroke gas piston Magazine Type: Polymer NATO STANAG Magazine Capacity: 30 Round Barrel Material: Chrome lined Cold hammer forged CrMoV Barrel Length: 16.5? Overall Length: 26.125? Weight: 7.9 lbs. Rifling: 1:7 inch twist 6 grooves Right hand Stock Type: Reinforced polymer bullpup configuration Sights: Folding front sight (blade) with Tritium insert and rear sight (aperture)