The "el cheapo" rails have fitment issues on some guns, are either wayyy too heavy, or extremely thin and have a tendancy to brake at the worst times. Obin is right, save up and get a quality rail (if you really need one) the only "cheap" forearm i'd put on is the magpul moe, this allows you to attatch tidbits of rail sections where you want them. If you are dead set on a conventional quad rail, go with knight's, daniel defense(my personal pref.), troy trx, or Midwest industries(slightly lower quality but cheaper)...look for a rail that's free floating, and most importantly one that's light..all those ounces add up on a rifle. Go to bravocompanyusa.com pretty much everything they sell there is of decent quality...stay away from yhm though, that'd be the low quality stuff.