I've had one with a fractured spring, but the tension was also noticeably absent. The top lever didn't flop around, but you could tell by comparison that there was a problem. There isn't a lot of room in the underside of the receiver, so a broken spring can still create enough tension to keep the gun closed. Good luck. If you aren't familiar, then I suggest you do some reading on the LCSMITH.ORG website before you start tearing in to the receiver. The top lever spring requires sort of a magic trick.