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I can't tell if you have replaced the grips, but my MKII fails to lock back if I tighten the top grip screw on the bolt lock side. I have replaced the factory grips with Pachmeyers. The rubber grips keep the bolt lock from functioning if screwed in too tight. I could modify them, but I find just not tightening the screw all the way works well with no mods needed.
You are correct, the bolt release isn't meant to be used to close the bolt by itself, like you would on a 1911.
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