You may be able to achieve this by taking off the butt plate/recoil pad and then access the bolt that keeps the stock tight by a hole through the wood.Use a penlight tom see what type of bolt nut,or screw slot is there before you tighten.
In front of the butt stock .
Mossberg 500.
The butt of a rifle or shotgun- the part that goes against your shoulder.
To tighten the stock of a Sears Roebuck double barrel shotgun model 101.7, first ensure the firearm is unloaded and safe to handle. Remove the butt plate and any screws securing the stock to the receiver. Inspect the stock for any visible cracks or loose joints, and apply wood glue if necessary. Reassemble the stock, ensuring screws are tightened properly, and consider adding additional screws or a shim if the fit is still loose. Always consult a qualified gunsmith if you're unsure about any steps.
I have one for sale. Message me @ garym6@cox.net
Remove buttplate. Use a socket extension and rachet to unscrew the stock bolt (it's in that hole in the center of the butt)
There are two small holes in the butt pad of the stock. Lubricate a Phillips head screwdriver into the holes and remove the butt pad. Using a long flathead screwdriver remove the screw in the center of the stock. To add new stock simply reverse.
I have one for sell in very good condition.
The butt plate screws (2) at the end of the stock must first be removed. You will need a long shank flat tip screwdriver to remove the screw at the bottom of the center hole in the stock butt. Reverse to reassemble.
Remove the butt plate. There will be a hole. There should be a slotted screw at the bottom of the hole. Use a long screwdriver and be careful to not damage the stock.
Try e-gunparts.com, gun show, gun shop, want ad.
You will need to provide a DETAILED descripton of ALL markings, gauge, barrel length, forearm, butt stock, etc..