Barrel Bedding - Use of Loctite

[Old Bob]

I used the 620 Loctite on the original upper receiver for my Grendel AR. It was a BCA upper & had a sloppy fit with my Wilson Combat barrel. I replaced it with an upper from Precision Firearms. The same barrel was a thermal fit in the PF upper. It didn't take a lot of effort to remove the barrel from the BCA upper. I put a 1" hard wood dowel in the upper & then gave the dowel one good whack with a dead-blow mallet. The 620 Loctite pretty much shattered & the barrel came out easily. What Loctite remained on the barrel extension just peeled off. 620 is for this sorta thing - cylindrical fittings at high temps. Blue (242/243) is a medium strength thread locker. It's bond can be broken using regular hand-tools. I wouldn't recommend using it for bedding a barrel.