As the title says - I’m not able to find a way to remove a gas block set screw that I treated with Loctite 272. It’s the high-temp stuff, and sure seems like a good idea at the time - since the gas block can sure get hot.
I’ve tried a heat gun, a butane lighter, and super glue solvent. I’m starting to twist the end of the Allen wrench hex key that I’m using. And afraid that I’ll stop the screw.
Background - this is on a PSA 8” 300 BLK upper that seemed like a bargain at about $300 shipped. The gas block was leaking, and I had to remove it at reseat it properly. It worked fine for about 400 rds, until this week I removed it to try to swap the barrel nut to affix a slightly different PSA handguard. The factory-installed barrel nut was so tight / seized that I gave up and made a slight modification to the existing nut to get the new handguard to lock down properly. Despite paying close attention, I evidently induced another leak when reinstalling the gas block. There was obvious gas residue on the barrel and inside of handguard after 60 rds today, so I started to take it off to re-seat to properly. The forward set screw came out with a little persuasion, but the aft on (the one that rests in a divot in the barrel) isn’t moving.
Any ideas? This upper is starting to be much more trouble than it’s worth.
Any suggestions on a higher-quality 7.5-8” upper? I’m eyeing Aero, but am open to suggestions. Does anyone make chrome lined 8” 300 BLK barrels?