Very well made! - Aero Precision M4E1 Enhanced 7in 5.56 Pistol Length Complete Upper Receiver with Flash Hider

I figured while I wait for the ATF on my suppressor I would build an AR style pistol. I am really liking how the rail mounts to the upper! I think its really slick that Aero Precision made the barrel nut and rail mounting two different things. The rail mount is solid! I combined the 12 inch m-lok with a 11.5 inch Rosco barrel and it is slick. I wanted at least 11 inch of rail for my long arms and i could not find one that i liked as much as AP. I have gone cheap on rails and uppers in the past. I didn't like the out come. This set up will spoil you. only slight con is the rail is wider then previously used m-lok rails but not to bad, just have to get use to it and adjust my set up. Aero Precision makes good and affordable stuff.