I have a few interesting tidbits to share with you all, I have had my own personal g 21 have a mis hap with the problems that are plaging you all, first I was in mandate training here in georgia, during a string of qualifing fireing my glock made a rather strange sound and saw dirty grey smoke come from the area between the slide and frame, the gasses vented unto my hands and turned them black, blew the magazine right out of the mag well, at that the closest range officer and real close partner ran up to me and we stopped all fireing on the range , much to my relief I had all fingers in place,our armour on duty checked over the glock and we found no problems, but for saftys sake it was sent off to glock with the shell caseing that was still in the glock, now what was found out is that the glock funtioned evactly as it was designed to, and thje at falt problem was the ammo,which was purchased at bulk factory reloads from a reputable reloading company the company sent me 1,000 rounds of factory 185grin speer gold dots for the miss hap, and I am happy to say the glock is in my holster today and after 5,000 plus rounds has never failed me and with proper care will never fail when at the time of need take care and be safe, as of now I own a g 17 g19 g20 my favorite hunter companion,and tried and tested 21. Kevin