http://www.gunandgame.com/forums/ar15/132298-bushmaster-ar10-handguard-compability.html This link has links if you scroll down.I use a Magpul handguard on one of my rifles I like it just have to add the rails.The setup they use with the T nuts ot blind nuts works great.DD is great product but a little more money,but you got rails now.Hope I was able to add to the confusion <lmao>