I can't agree with the original post. It's not a primer. And it misses the key points. The real problem is that you can fire many Glocks slightly out-of-battery -- especially earlier models, like mine. Combine this with the unsupported chamber in the feed ramp area, and you are left with a blackened, stinging hand, a look of shock on your face, and wondering what the hell just happened, and why your magazine became a projectile. (Fortunately only the mag.) I wasn't really injured, and my G19 survived with a new slide release, mag release, and mag, and has had another 1 - 2,000 rds though it. But it was clear from the undertone of my discussion with the nice lady at Glock that this was not an uncommon thing, even with 9s, and that they don't really think you should be shooting reloads or Federal ammo. These were the only reloads it ever shot, and it blew before I had 20 rds of reloads through it (commercial reloads, not home brew). I won't be shooting reloads, plated slugs, or Federal ever again. And I do think Glock should be seriously faulted for failing to call its "upgrade" a "recall", which would have saved quite a few of us the aforementioned stinging hand and damaged parts replacement. A proper warning, and a note about the "upgrade" would have been appropriate. This was not responsible corporate behavior. So I see three key issues: 1. ability to fire out of full lockup 2. excessive unsupported chamber area 3. failure to notify the customer base of the need to get the parts upgrade Add to this a fourth item, like a lead shaving, oversize case, dirty chamber, insufficient force chambering the first round -- anything which causes incomplete lockup -- NOW you have a Kb! Just my opinion, but one that is now obvious to me, and I'm sticking to it. -- cw Wanna kill these ads? We can help!