A elcheapo store bought screw may/can replace this tang bolt/screw. Possibly may not look
correct but it may work. You can also sand off the cadmium plating with a piece of 320 emery
paper & then brown it or blue it with a bluing pen.
All the Tang Bolt is doing is holding the stock up to the barrel, plus sometimes securing the
front of the triggerplate, or sometimes the front of the triggerguard. It is not required to
be a hardened bolt/screw. They sometimes get stripped out because people overtighten
them & it is not necessary. The breech "Fit to Wood" is suppose to absorb the recoil, not
the tang bolt. I always have wood clearance on the tang bolt/screw where it goes down thru
the stock to the triggerplate. If you have a sloppy breech/wood fit, the recoil can cause the
bolt/screw to strip or the stock to crack because of the tang bolt getting slammed by the barrel.