That's a Mossberg 500 model
Your Montgomery Wards Model 550ABD was made by the firm Mossberg and Sons.The Mossberg model 500 and your shotgun are one and the same.
Its a Sears branded Mossberg 500.
Manufactured by Mossberg for Montgomery Wards.
The Mossberg 395K (12gauge) was manufactured from 1964 to 1983.
Mossberg 500 is a series of shotguns manufactured by O.F. Mossberg & Sons.The 500 series comprises widely varying models of hammerless, pump action repeaters, all of which share the same basic receiver and action, but differ in bore size, barrel length, choke options, magazine capacity, and "furniture" (stock and forearm) materials. Model numbers included in the 500 series are the 500, 505, 510, 535, and 590.
the 500 is the whole series of shotguns, including all guages, the "a" means it's a 12 guage.
The Mossberg 500 Stock is the stock for the Mossberg 500 shotgun. The stock would allow you to get a better grip on the shotgun and absorb some recoil from firing the shotgun.
Not likely. The 930 is a gas operated semi-automtic. The 500 is a pump.
Sears Slug Model 446.511761 is a Mossberg 500. All parts interchange.
1950-1955
Introduced in 1952