I have a clamshell upper receiver jig as well as an aluminum one that holds it by the take down pins. I use them both for different stages of my builds. The trick is once I get the upper all clamped up, I heat all around the barrel nut with one of the blue bottle handheld propane torches. This helps free up what ever kind of loctite the manufacturer used. Works like a charm! The first AR I took apart was my Rock River. I could have sworn they welded that barrel nut on there! After using my head and finally applying heat, it broke free a whole lot easier. Same thing with the flash hider. Heat it up before taking it off.
"No free man shall ever be debarred the use of arms. The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government"
-- Thomas Jefferson, 1 Thomas Jefferson Papers, 334
Last edited by TexasGunner; 01-19-2014 at 02:11 PM.