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I have pinned mine via 1/8 rivet through the #14 witness hole. Then I filed the rivet down from the inside so it is just long enough to catch the follower but does not interfere with the spring. Not sure if this is the best way, but it does seem to work.
So would you get into some SERIOUS trouble if you had a 17-round Glock mag unpinned? I have a feeling you'd get in more trouble with an unpinned mag at the range than somebody with a knife who stabbed somebody to death.