I would bet it's not the weapon it's the handling. Holding it a little to lose which lead's to a short, lose handling quick jerk that cause's it.
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I seen the same thing happen to someones Glock at the range, firing pin plunger got stuck do to the spring being improperly installed. I took it apart, put the spring in correctly and problem solved.
I had a WWII P38 go rogue on me once. I'd been shooting it for several months after I bought it, then one day I aimed down range, pulled the trigger, and although I only heard one shot, three pieces of brass went flying.
I looked around to find the two unfired rounds, but all the brass around me was spent. I aimed, pulled the trigger again, again only heard one shot, but this time 4 cases came flying out. I dropped the mag and was surprised to see it was empty. The slide didn't stay open which it normally does when the last shot is fired, so I assumed a round was still in the chamber, but when I pulled it back, nothing.
That ended my P38 shooting for the day and when I got home I hit the internet in high gear. I saw that some Walthers had issues with a part that would break sending it into full auto, but mine is a Spreewerk and I couldn't find anything about them.
So I tore the gun down to check all the pieces to see if anything looked worn or broken, and found a 1/4" square piece of a cleaning patch stuck inside the area around the sear and trigger bar. I plucked it out with a pair of tweezers, put the gun back together and never had the problem again.
It's amazing what minor little things that are truly unintentional can get you in big trouble real fast. Had the 3 and 4 round bursts not sounded like a single shot or had someone noticed brass flying everywhere each time I pulled the trigger I'm sure I would have drawn some unwanted attention.
Glocks actually had this problem of going into burst mode years ago. Friend of mine had it happen in `93. It was kept quiet by Glock at the time but gunsmithing publications put out the info ( I may still even have the info from an old "gun test" pamplet laying around). Glock would just have you send it to the factory to have a known fix/modification quickly done to it. Figure by now that kink would have been worked out on all of them.
Thank you for the info on your Glock prob. Mine emptied the mag. when I pulled and held trigger- fun but embarising because it climbed over target. I found the extractor was shaving small pieces of brass from case causing the firing safety plunger to stick down into pocket and away the lead flew! I put a small radius on extractor (aprox. .005) fixing the prob.
Just so I have this correct, by ejector, do you mean extractor? And by the "itty bitty" spring do you mean the spring that fits inside of the firing pin block? I'm not trying to be a sarcastic asshole, I just want to fully understand what you mean because I disassemble the slide of my Glock's and want to make sure I don't come across this same problem. I'm referring to parts 8 (firing pin block) 9 (itty bitty spring) and 10 (extractor). You mentioned the word "cup" which would be part 7. I do better with pictures. Point out exactly what you mean.
http://www.reviewsofthings.com/image...view-parts.jpg
I like to keep the firing pin channel clean because of this very reason. Same reason I make sure the pins on my AK and AR move freely when assembled.
Did the OP mention what Gen this G23 is? I read through real quick and didn't seem to locate it.
GB