The pack includes the main section to go on the pistol (for the scope on top and torch underneath) as well as optional side fittings for lasers/any other additional accessories. They has 20mm mount rails for items with Weaver/Picatinny/RIS fittings. The main section is held on with 4 bolts and nuts and tightened with an Allen Key (all included). This pack will fit PT – 85, P -25, C15 Mk2 Blowback Tactical and Socom pistols. We have an excellent selection of accessories to complement your pistol available.