.40 S&W. 3.9" barrel length. SN: AM31278. Black Nitron finish to the rounds of the slide with polished finish to the flats and small parts, black Anodized frame, and mounting SIG SAUER marked green laminated wood grips. Short recoil operated DA/SA autoloading pistol fed by detachable double-stack magazines. Item mounts an accessory rail to the forward frame, MEPRO MH3 pattern rear sights and green fiber optic front sight. The right slide is marked SIGARMS/CUSTOM SHOP and additionally shows the Equinox model marking. Comes in a blue Sig marked synthetic hard case with two magazines, cable lock in package, owner's manual, and the factory inspector signed tag.