I was reading thru some of my gun magazines & found an article by Chuck Taylor written back in 1995. He stated that his Glock 17 9mm had over 60,000 rounds of full power service ammo thru it without a single problem. I own one myself & also have quite a few rounds thru mine with no problems. I can't speak on the others that you mention, as my Glock is the only poly gun that I own. Hope this helps.
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