toy's R us I can't match the Coast to Coast mod 660 however Savage, Marlin, Stevens, and Mossberg all sold various models to Coast to Coast and all of them made a pump shotgun. One of these manufactures likely made the mod 660. Find a Gun Values book and try to match the model to the photos.
That is impossible to determine without knowing the manufacturer and model of the shotgun.
It's a Stevens 620.
gunparts.com has them
cowbourd
To find a replacement stock for a Crescent Arms Empire Model 60 hammerless shotgun, you can check with specialty gun shops, vintage firearm dealers, or online marketplaces like GunBroker or eBay. Additionally, contacting manufacturers that specialize in shotgun parts or visiting forums dedicated to vintage firearms may yield leads. Custom gunsmiths could also craft a replacement if original parts are unavailable.
mossberg
At Gunstocks Inc.
Follow manufacturer's instructions.
We carry new replacement magazines for that shotgun.
@ turn of the century
Savage
e-Gunparts.com