.40 S&W. 4.25" barrel length. SN: 22-1856. Black HK Hostile Environment finish with polished upper breech, black synthetic frame, and fire blued triple white dot sights. Short recoil operated DA/SA autoloading pistol fed by detachable double stack magazines. The forward frame features Heckler & Koch's proprietary mounting rail system, and the left frame mounts the safety/decocker. Comes in matching gray plastic hard case with two magazines, and the operator's manual.