Designed specifically for use in Heckler & Koch VP9 pistols, the LMS-HKVP9 replaces H&K&';s factory spring guide assembly with a high intensity red laser sighting system for advanced target acquisition. Easily user installed without the need for gunsmithing or special tools, the Guide Rod Laser is constructed with rugged, precision components including aircraft-grade aluminum and genuine Wolff springs. Does not fit HK VP9SK.