FWIW, the AX 338 LM has a taper on the front of the brake with LH thread ahead of it & a nice flat at the other end of the brake above the muzzle, the factory suppressor has a thick O ring that seals on that flat section.
I assume that the 308 has the same set up.
The Brake is closed off from the suppressor & gets extremely dirty, carboned up, after a few rounds through it.
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