This is a dsi ds-15 12.5 in pistol in 5.56 with a Giselle h2 buffer assembly a rise armament trigger believe it is 3.5 or 4 lb and a 3 position super safety all the other parts are dsi the lower is billet this gun is super fast and alot of fun to shoot and a few mags u must be a nh resident with valid dl to buy this gun the optics are not included in sale