Is it a DIY bipod from the 1960s? It is on a 222 Remington ADL and I think it might be a first generation ADL stock. I have never seen anything like it.
I also don't know, following to get an answer. If its not a bipod, it almost looks like it could be a way to apply tension to the barrel? I kind of doubt it though
I wonder if it’s someone’s old walk around woodchuck gun for hunting the fields back east. Stab the legs in the ground and shoot. They look long enough for shooting sitting.