Pál_K
Single-Sixer
Maybe I'm just not holding them right, but with both my Mk II (35 years of use) and Mk IV (bought last year, no problems), my thumbs are nowhere near any moving part - they're near the trigger guard. The web of my hand is covered by the top back of the frame, above which the bolt cycles.
I hold some revolvers with my left thumb crossed over and behind the web of my right hand - if I were to do that with a semiauto, I'd get bit.
I hold some revolvers with my left thumb crossed over and behind the web of my right hand - if I were to do that with a semiauto, I'd get bit.