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Mossberg 500 20ga

Grizzly_A

Grizzly_A

Portland Metro Area
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I am curious to the dimensional differences between the Mossberg 500A and the 500c receivers. I have had limited success in finding blueprints online, and I have heard that the 20ga receiver is a little undersized, but haven't found anything definitive.

Does anyone have a Mossy 500c that they would loan me for a weekend so I could take measurements to satisfy my own knowledge?
This is one of those "because I can" type of projects.
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