I am aware of the following related Iver Johnson 12 gauge single shot guns:

Champion (plain barrel)
Matted Rib
Special Trap (Vent rib two beads trap stock)

My barrel was "Browned" not blued.
Some barrels were blued and some receivers were case hardened.

It shoots nicely and locks up solid.
I hope to use it for trap.

I do not hunt, but if I did, this would be the gun I would use.
It is choked on the low side of full (about .034)

I am looking for a vintage 2nd generation Jostam Antiflinch.
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I have a browned IJ Champion from 1923. Very comfortable, will go hunting with me this fall. Cost all of $45 2 weeks ago, still solid and tight, 30", Choke bore. Nice wood for a plain gun.

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