Had a problem in a different gun that uses SIG magazines: a failure to lock back on the last round. Traced it down to a particular magazine (all of mine are numbered and accounted). It appears that the follower on it sits just a little deeper when empty. It is a Circle-J magazine.

To underscore, everything works great in a factory P320. So the magazines are up to whatever spec SIG sets, but they are not the same as MecGar and they vary in detail.

Did we find out which vendor makes Circle-J?

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