•Precision machined for maximum strength•Four mil-spec Picatinny rails for versatile accessory applications•Clever rail system locking design includes lower connecting walls mating with upper channels to achieve the most solid, secure fit:-Lower quad-rail system to secure barrel-Upper quad-rail system to secure gas tube-Simple and friendly installation, no gunsmith or tools required•Great zero-retention capability for all accessories installed on the rails•Intensively tested by field experts under extreme heat and sub-zero temperatures and demonstrates most satisfactory performance•Ultimate tactical solution to enhance accuracy under toughest environments•Fits model 47 and variants•Hard anodized finish for wear resistance•Great quality 12-piece UTG rubber rail guards included for comfort and protection