Should be a single-shot made by Savage/Stevens. We have new reproduction stocks. www.countrygunsmith.net
Mossberg 500.
You want product #172820A at numrich gun parts corp.
LONG out of production, the company is no more. You may find a used stock at gunpartscorp, but you would need a match to the correct model- there were dozens.
Gun Parts Corp has correct Higgins buttplates, but they would have to be fitted to the stock.
Best left to a gunsmith
I have a used "riot" 520-30 butt stock.
Remove the butt plate. There is a hold in the stock under the butt plate. The stock bolt can be seen at the bottom of the hole. Obtain or make a screwdriver (or socket, if it is a hex nut) to fit the bolt slot. Be very careful to not let the screwdriver slip out of the slot when you are unscrewing the bolt or else you can go right through the side of the stock and ruin it.
It is easier to by a board of oak or walnut and make your own. I did, because I could never find one any where...
ebay, gunbroker, Brownells, Midwest gun works - all on line
first get you new stock the take the butt pad off of both the new stock and the old there is a bolt inside thread it out and put the new stock on and put the bolt back on then replace the butt pad
No.
I recently came across an early 1900's model 12 gauge NR Davis and Sons on an auction site that needed repair to include a complete butt stock. It was priced at $220.00. .