I have a Martini 12/15 with a light and very smooth trigger pull. Not sure exactly what causes it, but it will fire without the trigger being pulled, and I can't pinpoint one thing that causes it. Doesn't happen all the time, maybe once every 30 shots. I originally thought closing the bolt was causing it, but I've slammed it shut without it going off. I'm thinking maybe the sear is worn out or modified too far. I just purchased this for one heck of a deal, knowing there's probably issues. This thing shoots better than expected, so I'm very happy with it. Any help?