10 Gauge Under Lifter Hammer Gun Internals

[CW Nickle]

Hello,

I recently purchased an 1876 10 Ga. Hammer Lifter Gun and its still in working order as the guy I purchased it from was using it in cowboy action shooting. However, it could use a little work to function a little safer. I noticed when I was operating the hammers that my left hammer was not engaging the half-cock notch and the sear engagement is very light. The hammer also has considerable wobble, not enough to be a wall hanger but concerning as I would like to prevent doubles from recoil. I suspect that my issues might lie with the hammer pin being worn down from years of use.

Is there a way I could restore the internals in the action without ruining the authenticity and keep it functional? The action is otherwise tight and the bolt is in good shape. I also wonder if anybody has hi-res images of the internals of a hammer gun as well as some tips on rebuilding the action?

Also my gun is stamped with a T 12 on the barrel flats, there is no grade called out on the reciever flat but the serial number is still there. I have been trying to understand the grade and T is the only letter in the vicinity, I am 99% sure its a grade 0 based on it being plain twist barrels and a hammer gun, but it would be nice to understand the markings better as my grade marking is absent based on the location provided the technical information from the collector's association.

Any help is greatly appreciated, thank you!