This TG36KER Rifle is painted in Tactical Gray Duracoat and has a 16.5" Black nitride 1:7 twist barrel threaded in standard 1/2x28. Also has the K/Mid-length piston-operated gas system and can use the K or E full-length handguard. This comes with a German-style S/F marked lower, (2) color matched G36 P-mag, K/E side folding stock and a range bag with TBT patch. 16.5" Black Nitride Coated Barrel 1in 7 Twist Threaded 1/2x28 K Handguard Includes 3-Piece Rail Kit Weight 7.1 lbs OAL is 37" folded 27.5" Gas Piston Operated Caliber 5.56 NATO Extended Bolt Release