I have a Tikka T3x light. I had the barrel shortened, fluted, and threaded. I put a Stocky carbon fiber stock on.
I was on a pig hunt recently. I chambered a round but didn’t fire. When I put the safety on, it fired by itself. The guys thought I had my finger on the trigger but I didn’t. Thankfully I always keep the muzzle pointed a safe direction. Later I put the safety on again but had everyone watch. It fired again. “Terrifying” is how several people described it. The gun was clean and the temperature was about 50 degrees F.
Later at home with snap caps I could reproduce this every time I put on the safety. I removed the trigger guard and stock and found that the single Allen bolt that holds the trigger assembly on had unscrewed about 1.5 turns. I tightened it up and the issue was fixed.
I was wondering whether this was due to the aftermarket aluminum trigger guard or CF stock, so I completely removed them. I was able to loosen the Allen bolt and, with the trigger assembly just wrong, could make it fire again by activating the safety. I have a video but cannot post it here. This proves that it was not an issue with my mods. I have now added thread locker and cranked the bolt down tighter.
I must have caused this by not sufficiently tightening the bolt after I got the barrel back from shortening. Still, I don’t understand how any trigger-safety assembly could be designed so that this could ever happen.