Handguard in .308AR Parts Posted 15 hours ago · Report reply 1 hour ago, NightStalker said: I was just on Aero’s I’m confused do you need an enhanced receiver and a special barrel nut to use the HG? They have the "enhanced" receiver that takes the special setup, and they have the standard M5 stuff. The rail bolts to either one - it's the same rail. What you ORDER is what matters, because if you order the rail for the "enhanced" is doesn't come with a barrel nut - because the "enhanced" doesn't need one. It bolts directly to the upper receiver on the M5 Enhanced. What doesn't your upper look like? It's either "this" or "this", below... Enhanced: "regular" or "standard"