I see you are still around so I will respond to this old post, I don't think I ever did directly. My history around glocks goes back around forty years. I have seen them refuse to function, break too. Have to admit I have seen 1911's fail to function too but never a Hubilt one. They are famous for running like seven day clocks.
They have probably tinkered with plastic formulas since then but glocks were breaking, the plastic breaking, in New York City. There are colder places than NYC in the US and I would hate to be betting my ass on those glocks. The design of those glocks pretty much sucked too. My Colt Commander still has the series 80 parts in it and hasn't had any issues ever, decades now.
My nephew has two or three commissions and toted a glock as his duty piece. Another brother, not his father, and I were at the nephew's house. We were talking pistols a bit and my nephew said a 1911 wasn't accurate. My brother didn't even look at me. We were in my truck so he knew where the Commander was. "Get the Commander." It was in rock and roll mode, loaded to the brim with 230 grain Hydro-Shoks. There was a little berm rolled up, a heavy truck tire track. We put a sixteen ounce coke bottle in front of it and my nephew set up at about twenty to twenty-five yards out. First shot made the bottle fly and the lid came off. Second shot, the coke bottle flew out of sight behind the little berm. I figured point proven but my brother had no mercy. "You can still see the cap." Third shot got the cap. No more crap about a 1911 not being accurate.
When I was in tune I could put fifteen shots in a hole it was hard to point your fingers and force your hand through, rapid fire, ten yards. Happened to be a federal agent on the lane next to me when I did my usual finish to a day's shooting, fifteen center, fifteen head of a B-27 police silhouette. Draw, fifteen rounds, reload, fifteen more, somewhere between ten and twelve seconds total. I happened to notice the fed. He was literally white as a sheet. Only a few times in my life I have seen someone that pale. He started coming out once or twice a week and got pretty good himself. He toted a Sig. P-220? preplastic fantastic.
I am not slapping glocks in particular, I wouldn't want to carry anything plastic to bet my life on.
Hu