An accumulation of wipe-out will form some crud on a trigger mechanism. Keep it in the barrel. FWIW, I had the same thing happen to a Nula with wipe-out. Difference was the firing pin on mine would drop when you took the safety off or wouldn't stay in the firing position when you opened the bolt.
Melvin is a pretty nice fellow, but like the rest of us he can get cranky.
I've yet to come across a gunsmith especially that isn't grumpy! Oh well though, I don't care if they are grumpy so long as they do good work. They aren't gonna hurt my feelers.
