Two frame 20s do exist. "Spin Drift" a member here has a 2 frame. I have never seen a 1/2 frame 20. When the 1/2 frame came into existence maybe that was an offered size and maybe there is one out there somewhere but I have never heard of one.
To add further confusion Steve Barnett Fine Guns has a 20 gauge currently in their inventory on a 1 1/2 frame. That is one rare bird!
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"Training is like fighting a gorilla, you don't stop when you are tired, you stop when the gorilla is tired"
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