Originally Posted By boomfab:
Red loctite performs very well under high heat.
I've used it extensively with suppressor mounts, muzzle brakes, and competition pistol comps. It does much better than Rocksett in my real world use of the products.
But it breaks down at 500 degrees (per the manufacturer). A barrel will easily exceed this temperature if fired repeatedly - such as at a carbine class. Rocksett breaks down at just over 2000 degrees. If you never shoot it enough (or plan to) to go over 500 degerees, then I suppose 271 would work fine - depends on your definition of high heat.