Sorry about the no pictures. I am at a loss at this point. I don't sincerely think that dropping this gun set it off. I got to a point of frustration last night and did something rash. I set the breach block on a piece of wood, the front of the action on another piece about 2" from the forks and let it have it with a 48oz soft face sledge. After hitting it harder than I thought I should it hasn't changed a thing about the gun. My sleep deprived thought was that if dropping it did it than I would un-drop it. I have fixed much more complex things like that in a moment of inspiration, persperation and frustration. That's just too much 'tion.
So, after that I modified a set of scope sights, mounted up and shot some rounds, what I noticed is that the breach would have a gap after the shot, even when it had mated well before the shot. Consequently, I could put two shots through the same hole and the third would be 1.5" off at 15'. It took getting close to zero-ing the scope to really understand that the concern is barrel movement. So, I played some more with the pin, carefully knurling and fitting the best I could with a center punch and file, very crude but I have no machine shop at my house. I have also found that by appearance the breach block is only spaced squarely in the forks when using a .067" shim on the left side of the breach block and the OEM .063" on the right. Speaks of something tweaked. My thought is to have my Dad set the action in the milling machine and do some indicating to see if the forks are the source. That will have to wait 'till he gets back from a trip. I also took out the lockup, inspected and added about .090" behind it to snug it up, haven't shot it yet to see if it helped.
Meanwhile, the gun is packed up for the trip this weekend, shoots fine with open sights, and who knows, I may mess with the scope and stuff some in a more relaxed environment, maybe a few cold frosties will bring some clarity to the situation. Anyhow, I will get the opportunity to shoot the likes if a Gamo Big Cat (or three), a BAM that a friend just got (tuned and lubed), a winchester something or other and put a few hundred rounds through my PT80. Thanks for the interest and ideas. Oh, by the way, the GT III trigger is a dream! Fine piece of work and a cinch to install. If nothing else I will have the finest trigger action of all the Gamo's in camp! I'll have to yank it out if I decide to sacrifice the gun in the fire.
