[Dollar]

So I found a hammer/underlifter the other day.I did not buy it but I'm going to I think.
First question is there was no number on barrel lug.Looks to be ground off.I had a chamber gauge with me.I put the 10ga in and had a good bit of room.I am assuming its a 8ga?So measuring the firing pins(1 5/16)is the conformation?
Frame would be a 5 frame at least?
I did not have a tape measure but believe they were 30 and looked uncut twist barrels.
Stock was cut I'm sure if original.
No pictures yet.

Thanks