The Standard FIRE System rail was designed to mount easily over the integral rails of the M16/AR15 flat top receiver and work in conjunction with the MAD or A2 Style BUIS flip-up rear sights. As the rail raises the line of the sight by 1/2 inch, the rail offers a proper cheek weld when optical devices are attached. In addition, the scout rail serves to protect the flat top receiver's integral rails from the wear associated with quick-release-type mounts. The Standard rail has been employed mainly as a riser for conventional optical sights. Manufactured from 6061 T6 aluminum alloy, black hard-coat anodized, the GG&G FIRE System Scout rail meet MIL-STD-1913. The rail locks onto the flat top receiver by means of a locking side bar and two socket head screws. This provides both a positive and perfectly aligned lock-up even on well-worn receiver rails. The socket head wrench required for installation is included.