When I was young and starting out in NSSA skeet and was too poor to buy a real Model 12 Skeet Gun, I made my 12- and 20-gauge skeet guns by having Simmons whack the longer barrels of Model 12 field guns to 26-inch and fit their 3/8 inch wide vent ribs. I posted enough 100 straights with those two guns to know in my mind "you don't need no stinking choke" for NSSA skeet targets.
A few years back I picked up a Remington Model 31TC in a multi gun deal. Its original 30-inch modified choke vent rib barrel had been fitted with an ITC choke tube giving it .054" choke. By chance I happened upon an unmolested Model 31TC 30-inch modified choke barrel. Even had the same year date code as the barrel on my gun. Once my machinist buddy had the new barrel fitted and working fine I had him whack the original barrel through the first rib support and reset the front bead. Another fine skeet gun!!
In the last few years I've picked up a 20-gauge vent ribbed SKEET barrel for my 20-gauge Remington "Sportsman" and a 12-gauge Remington Model 31 SKEET barrel. The chokes in those barrels are similar to Winchester's WS-1 or Savage's skeet cylinder in their Fox Skeet & Upland Game Guns. About .005" or .006" choke and then a flare in the last inch or so to the muzzle.
