It's all original. I don't modify weapons unless it's with OEM parts. I've seen too many people FUBAR brand-new GSGs by adding after-market stuff not designed for it. As for a weapon malfunction being illegal, that is the stupidest thing I have ever heard. If this is the new standard, then there are about 200 people that go to my range alone that should be serving time currently.
If I had to guess, I would say that the accumulation of lead and carbon caused my firing pin to momentarily stick causing successive slam fires. I don't think 200rds of .22LR is enough to cause a cook off between rounds. It's not done it since I did a thorough cleaning.
I estimate that I probably had around 900rds total through the weapon without cleaning completely. Between the last couple firings, I just bore snaked the bore and gave it a squirt of CLP. I was planning a complete cleaning after every 1500rds in order to keep the wear and tear off the screws everyone is having a problem with.
Just wondering if anyone else had this happen. If not, then know that it could be an issue if your weapon is not cleaned thoroughly after 800rds or so.