Ok, so long story short: I bought a lightweight 16" freedom upper a few months ago to use as a duty rifle. I've since left that agency and decided I would try a 6.5 barrel in it. The problem is that I can't get the barrel nut loose. I've tried heat, cold, penetrating oil. I took it to a local gunsmith who dinged the upper pretty badly trying to get it apart, and ultimately he told me he couldn't get it apart.
I tried calling the toll free number on the website to see if loctite was used, but after waiting on hold for 15 minutes and hearing my personal pet peeve ('your call is very important to us') over and over I finally gave up.
I am not pleased. I've built and bought probably 20 different AR's over the years, and this one is the only one I've ever had to use more than a wrench and 5 seconds of time to take apart. This is ridiculous.