That thing in the first pic doesn't look like a rifle.
It looks like an abortion.
Dave
I designed and built a lot of the parts myself. That was my 257 Roberts Ackley rimmed wildcat project.
I wanted a bi pod mount that did not flex the barrel on a falling block.
If I did it again, I would go co-ax tube around the barrel [like some AR15s] instead of a 1" Aluminum tube below the barrel.