They are Gen.2 that will use all accessories, not just allen screw fittings. Made by SGM TACTICAL for Saiga 12 shotgun without gunsmithing. Fits perfect. US Made from a premium DuPont HTN-50 high temp blended polymer, extremely rigid and durable in the harshest conditions. The 3 Picatinny rails extend slightly past the gas adjustment knob to allow you to mount all of your tactical lights, lasers vertical grips or any other attachments that fit standard picatinny rails. This is a "Must Have" for your Saiga 12 shotgun. SGM TACTICAL