Mossberg did indeed make that gun. It is probably Model 320 or possibly Model 321. I cecked Numrich Arms Corp. (www. e-gunparts.com) for a relacement stock, and they currently have none on hand, but you need to keep checking periodically. I assume the original stock was wood?? If you are looking for a synthetic replacement, this may be a tall order, if none were ever produced by the factory. I would be very surprised if any of the aftermarket stock manufacturers will or would produce a synthetic stock for it. Places like gunshows, dealers, traders, gun trading periodicals, etc. would probably be a good bet to look for a replacement also. Good luck...