First you need to figure out what compnay made it. Different companies made them and they were rebranded for montgomery wards and other retailers. I have a 550ar and it is a mossberg 500. I have bought numerous products for it now and all have fit precisely.
170-290
I have this model shotgun, but it has a broken firing pin. The gun is usless to me, but would make a good parts gun. The stock is in excellent condition.
Any mossberg 500 stock will fit
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...
Try e-gunparts.com
The gun was made by Noble, and is long obsolete. No aftermarket stocks that I am aware of, so you would have to find a donor gun to strip out. sales@countrygunsmith.net
Yes the stock on a Winchester Model 12 16 gauge is the same as a 20 gauge. 16 gauge,20 gauge, and 28 gauge are all the same for the Winchester Model 12. Thanks, Tim
5100 is the Stevens model number, not a serial. These were made c. 1931-1941. The plastic was called "tenite" and often broke.
No
http://www.e-gunparts.com/DisplayAd.asp?chrProductSKU=68020&chrSuperSKU=
use a saw and chop the stock, then refinish and attach buttplate.
I have a pre-1977 Western Field 12 Gage Wooden stock and Forearm in very good condition that I will sell for $50. This shotgun is totally compatible with the Moss If interested I can send pictures. I will accept Paypal. My email is gdoss@aol.com