Good story about your son. Those rifles are good ones. As I have mentioned before my late dad made tooling for High Standard when they made up the M50 & M51's for Sears. HS made the barrels and put the rifles together in their New Haven plant. I visited that plant with my dad.
The Hawks article mentions a hinged floor plate and the M51 had I have has one that could slide off and it has a push button to release it but no hinge.
I see, like my dad, you added a recoil pad.
