You picked a real honey to fix up. The mashed wood fingers at the head of the stock is unfixable short of splicing, which requires the talents of a real artisan, and the forend is in the same shape. Screws wallowed out, probably has some pits in the barrels just guessing. A hard-used old brown gun. Have fun and good luck…
JR

Be strong, be of good courage.
God bless America, long live the Republic.