Originally Posted by JoeBoy
The guns that have rails on them are configured in what we call a "monolithic profile" meaning there is no gap between the upper receiver and rail and they are on the same plane.
We tried doing the one piece upper thing in the past but it just didn't make sense; we deal with a lot of customer who go charing through doorways and putting themselves in harms way (God Bless them) and they made a very good point...if they are charging through said doorway and smack their rail on a corner or what have you, bam! rail is bent easy fix though, replace the rail. IF you do the same with the one-piece upper you're now stuck having to replace the whole damn thing.