A Marlin / Glenfield model 25, Pre-1968, which I bobbed down myself.
I hacksawed the barrel off at 16 1/4 inches,
cut 1.5" off the buttstock & remounted the butt plate.
Removed the iron sights and topped it with a fixed 4X power scope made in Japan I believe from the early 1980s, not made in China.
I gave it to one of my good friends as a birthday present at a time when he had a big squirrel problem around his house and was shooting them with a pellet rifle but wanted something more powerful.