The rail is constructed of metal, and made by Marui.  Adds a nice even weight to the pistol and also includes a threaded muzzle adaptor for adding a mock suppressor.  With the rail installed you can attach a scope or red dot  - but most players add this rail becasue it makes the pistol look so much meaner.  The M93R Rail is a quick and easy installation - simply remove your existing slide and replace it with the new one.  If you want your "Plain-Jane" 93R to turn some heads, then slap on this rail system and watch their necks snap.