The railed gas tube will fit all (stamped and milled receiver) AK rifles with a standard length gas tube. Length is adjustable for variation between rifle manufacturers. May not fit all AK variants please contact if unsure of fit. Any modification to product will void all warranty. The 5 inches of Picatinny rail provides space to mount optics and accessories. The low profile of the rail allows lower 1/3 co-witness with some optics. The Railed Gas Tube will work with factory hand guard independent of the Short and Long Bottom Rails. Replaces factory gas tube easily; no gunsmithing required. Machined from hardened aircraft aluminum with stainless steel components and finished in MIL-SPEC hardcoat anodizing. Attach optics and accessories to the Picatinny Rail.