Other than it being bloody tight when I first took it down to clean I have not had it come loose at all.

Barrel screw was not tight on first take down and I tighten it up by hand and so far it is still tight.

I put 300 rounds through it today and it still snaps loose when I undo it.
In total about 700 rounds with no issues.

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40 yrs Millwright Machinist