It looks like the last name is just four letters, right? If you could figure out the first letter That would sure help!!! I am thinking a P or a J,,,?
Another note, this is just my pet peeve,,,,. I know a lot of people, tend to call Half stock rifles "plains rifles" but in reality a plains rifle is of much larger caliber, most over 50 cal., and in a more robust in profile. During the Lewis and Clark Expedition this is what Captain Clark wrote about his "small" rifle.
"and I took one man and went on Shore the man Killed an Elk I fired 4 times at one & did not Kill him, my ball being Small I think was the reason,"
I Shot at the ducks and accidently Shot the head of one off, this Duck and brant was Carried to the house and every man Came around examined the Duck looked at the gun the Size of the ball which was 100 to the pound ( ie .360 size ball)….Ed