One of my suppressors specifically says not to use copper grease.
The best grease for the thread is a lithium one with as high a temperature rating as you can easily find.
Thread cleaning with a brush seems to be a must for my 22 suppressor. The grit that appears there is very hard. For me it works best to wipe with hoppes 9 and a patch plus a small bristly brush ( a double ended one the lttle end).
I once had a suppressor on a 22 and it shot well for 30 years then suddenly didnt. The aluminium threading must have got stretched and loose even when it felt tight. Arthur Cleland confidently said “Buy one of these” a new expensive MAE. He was right. It shot well again as soon as I screwed it on.
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