I enherited two Sportsman 58s from and uncle.
One 12 and one 20. They both have Polychokes and are good hunting guns. As far as I know you cannot convert the magazines to hold any more sheels. Also the reason these guns were redesigned and dropped from inventory was a tendency for the bolt to slam back hard enough to crack the receiver. I had this happen with the 20 so I had to retire it. Other than that it is a good hunting gun.
Good luck,
ts
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