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Yes, the Mossberg?æ500 20 gauge ammunition can be used in the Mossberg .410 model. To find out if ammunition will fit, the Mossberg company stamps the size needed on the side of the barrel.
Check
$130-$150 in good condition, great gun
Mossberg
http://www.e-gunparts.com/productschem.asp?chrMasterModel=0840z500
75-300 USD or so
Mossberg, It's the same as a Mossberg 385K
improved cylinder
Yes, there were several made, mostly by Mossberg.
1947-1950
about $100
it is a Mossberg