.40 S&W. 4.49" barrel length. SN: GSK770. Black Gen 3 Glock "Frying Pan" finish to the slide with black synthetic frame featuring finger grooves, and thumb and finger rests. Short recoil operated striker action autoloading pistol fed by detachable double stack magazines. Mounts factory Glock adjustable target sights. Item features a mounting rail to the forward frame, and comes with an extended slide stop, magazine release, and flared magazine well extension around a widened magazine well. Slide has twin ports with corresponding ports in both the original factory .40 caliber barrel, and a KKM/PRECISION .357 Sig caliber barrel. Comes in a matching black plastic hard case with accessories including: Two fifteen-shot magazines with extensions (both marked for .40 caliber), nylon bore brush, GHOST BLOCK internal locking system in package (key for it is missing), and the owner's manual with ad inserts.