On a semi auto, it would be more than a blister. More like instantaneous evaporation of flesh into thin air. With the cover on, you might be able to mitigate that to first or second degree burns. I mention that just to say if you need to tighten you still have to use an oven mitt. Two mags of triple taps will get mine hot enough to burn the wood on my loading bench (like actually burn a chunk out of it), and I don't even shoot very fast.
I could be misunderstanding the question, but I assume what he meant is whether the cover will hold in the heat, causing the silencer to get hotter than it otherwise would have, making the baffles erode faster. Especially with titanium, I could see that being a real concern. Destructive meltdown style testing is going to kill it regardless, but during a more normal session where you're just doing some drills and giving the can time to cool it could make a difference. Coincidentally, some of the more premium covers use materials like kevlar that have a higher tolerance for heat than titanium. Like you can get them into the above 500 Fahrenheit range where the lightweight cans don't like to go.
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