Have "fooled" with all types of single selective triggers: H pattern on Brownings, trigger button on Model 21's and Skb's,
the pendulum on the Ruger Red Label. They are all inferior to the original barrel selector, double triggers. I have a 12 gauge Beretta 626 Sporting Clays model that I bought used after shooting a borrowed one well. Had seller send it straight to Cole for double triggers. Just bought one of the Upgraded 626 Black Onyx from Cabela's a couple of months ago. 20 gauge with 30 inch barrels and sweet wood. Also had them send it to Cole's first for double triggers. (should be a great dove gun) I have tried most all of the "gadgets", that are trying to fix something that was never broke.