Bought one of these 2 weeks ago. Fired about 100 rounds. All fine then the laser just stopped working. Replaced batteries, still dead. Called SW. They said there has been problems with the lasers and they would send a shipping label and replace with a new one after I send them the old one. Really aggravating...don't they test these things....I like the gun but after reading about all the continuing issues not sure what to think. Serial is EAT5XX.