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Difference between 12 ga receiver stamps 500 and 500a

I am looking at buying a 12 ga Mossberg stamped 500 on the receiver. My Mossberg is stamped 500a on the receiver. What is the difference? I have not physically see the 500 stamped gun just 2 pictures. It has a 20" barrel with a 7 round mag tube. My gun has a 28" vent robbed accu choke barrel. Can't find any info telling me the difference if any. Please help me finding the difference if any!
Last edited:

old mossy

Global Moderator
Staff member
Global Moderator
The 500A is a 12ga.The 500 (assuming) it's a 12ga is the same gun.