Took a risk and bought a used grade IV Ugartechea 20ga of GunBroker. I got to go look at it today and was pleasantly surprised. It still had grease from the factory on it and besides having the stock cut for a pad I can't say it's ever left it's box.
Go shoot a couple of lines of skeet. Do it several times changing from back to front on station 1,2,3 to front to back when you get to 4 or 5. Keep shooting singles til you can anticipate the direction smoothly. I go back to back to front on #7. Having a back trigger is great for late season roosters who flush wildly