My first Glock, a model 21 in .45 acp. Once I got to 10,000 rds of my reloads w/o a hitch, I quit keeping track of the ammo count. This gun has yet to have any type of malfunction.
My Glock models 17, 19, 26, and 34 have all proven themselves as well. I don't have a round count on these models, but none of them have malfunctioned to date.
BTW, all of them are at least 10 years old.
My Colt 1911 XSE Government model has also been flawless. I was cautious about its reliability due to what you hear & read about 1911's needing lots of work to run correctly. I figured I would find out for myself. I got the gun home, and cleaned & lubed it. I then put various types of ammo through the gun until I hit the 1,000 round mark. At no time was the gun cleaned, or re-lubed during the firing of the 1,000 rounds which were fired over a span of a few months. The gun had absolutely 0 malfunctions.