glock 22 is what i have. 40 cal. and i have easy over 12k rounds through it with no problems.
i bought it from a dealer through glocks trade in/reman program. when a department wants new guns they can get a credit from glock trading their old ones in. then glock goes through and replaces all the wear parts and checks everything else out (same barrel, slide and frame) the slide on my gun is stamped with the department name where it came from so thats kinda cool (OSP melts their guns down instead of trading them in, why save money when ohio is made of it) my gun was made in december of '97.
also with glock you can send it to the factory in GA anytime and they will go through the gun and replace any worn or broken parts for free.