.40 S&W. 3.9" barrel length. SN: AL37897. Black Nitron finish overall with black anodized frames and mounting black synthetic SIGSAUER marked grip panels. Short recoil operated DA/SA autoloading pistol fed by detachable double-stack magazines. Item mounts standard two-dot iron sights, and comes with standard controls overall. Standard make and model markings. The handgun comes in its original blue plastic hard case with accessories including three ten-shot limited magazines, one Sig made .357 SIG caliber barrel, and the owner's manual with training flyer.