•Pisten driven side charging semi-auto   •Flat-top upper receiver combined w/full-length top rail on handguard for continuous uninterrupted rail extension   •Threaded (5/8″-24TPI) barrel w/Noreen-designed muzzle brake   •Railed gas block   •1:10″ twist   •Match trigger   •Adjustable stock   •A2 pistol grip   •No sights   •Black finish   •Wt.: 13 lbs.