This combination kit is for: Glock19 Gen4 (or compatible); This kit provide unprecedented recoil reduction and match grade accuracy; 44% recoil reduction in combination with Ramjet (115g ammunition); The Afterburner compensator is machined from hardened 17-4 stainless steel, with a DLC (Diamond-Like Carbon) coating; The Ramjet barrel is machined from hardened 416R stainless steel, with a DLC (Diamond-Like Carbon) coating; This combination achieves low friction, high hardness, and high corrosion resistance; The Intra-Lok mounting system uses the taper lock principle; Taper-lock screw interface; no Loctite, shims, or setscrews needed; Makes length of G19 into G17 length, fitting all G17 holsters; Angled front faces on the Afterburner aid in holstering; Black fluted stainless steel; No threads, legal for sale in all 50 states