It's gonna be a month or so before I can test fire it, but I've cycled numerous rounds through it without any problems. I'm almost certain the problem is solved. I honestly can't say if the recoil spring assembly was assembled correctly. I believe it wasn't. And since it has had very few rounds put through it, I'm having a hard time believing the spring quit working. My best friend was with the previous owner the last time it was fired. He fired it himself and he said it had no issues. I am having a hard time finding a replacement spring. Everyone seems to be out of stock.