I've had a few semiautos that didn't like being +1. Inserting a full mag into a chambered gun made it more difficult to be sure the mag was fully seated.
However my P01 seems to have a bit more extra mag follower leeway and it just snicks right in regardless.
I had a terrible time with the Sig 220 during competition. Some stages call for a reload after a couple shots, and I'd have to download the magazine by one just to be sure it would seat.
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