Dave----Mossberg makes an O/U combo set that has a 28" vent rib 12ga set of barrels and a 26" 20ga set. The two gauge set is less than $1000. Both the 20ga and 12ga has screw-in chokes.

They call it their "Silver Reserve".
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"...the pool hall I loved as a kid is now a 7-11..."

If you don't like our prices bring your wife down and we'll dicker.