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DPT have instructions how to maintain it.
They suggest taking apart the modules and spraying with CRC 5.56 or WD40 after use. You'd have to ask them just what this is supposed to do but it seems to...

Yes,
Even magnums like 300 Win Mag will still be designated as 30 cal. But the suppressor itself is bigger so you do need the magnum model. There's just more hot gas to contain.

Quite often...