Quote Originally Posted by balyon885 View Post
Was considering doing one for my 300blk. What hand guards are you using? Have heard some wont clear the pistons.
latest gen of magpul moe hg's work. The early ones do not have that hump / rise in the center of the top hg. I milled out a samson rail for one upper.

http://store.magpul.com/product/MAG440/184