I have two, and they get shot on a regular basis, and Ive had no troubles. The RTF 17's are my favorites, and the only glocks I dont bother stippling.
I actually have a number of gen 3 17's, and they all seem to work fine. When I have had issues, it was "old brass" related. By that I mean, they had been reloaded so many times, the rims were all tore up and I think the extractor was having issues getting a good hold. Switch to factory, or fresh realods, and the problem immediately goes away.