Great pistol. I lament the passing of the third gen guns and simply do not like the MP line-up. I remember when the third gens came out, they generated a great deal of excitement. They were a marked improvement over second gen guns in terms of ergonomics and trigger pull.
I carried a 4506 as an authorized duty weapon and its heft was reassuring. Since these guns are no longer being supported by SW, I'd grab spare parts to keep the 645 running for a long time. Springs, maybe an extractor, etc.
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