Larry DelGrego & Son in Ilion NY have the original Parker Bros machine that cuts/grinds the sears to restore the proper angle/fit. It's a pretty simple fix for them to accomplish.
I had a 12ga Trojan that I have owned since '84 begin doubling 3 years ago, when a pull of the front trigger resulted in the simultaneous firing of two 3 3/4dram 1 1/4 ounce loads of Bismuth. It killed the Greenhead I was attempting to shoot, made a very loud report and hurt my fingers by jamming them hard into the trigger guard. I was able to replicate the problem without pain by inserting an empty primed hull in the other barrel and looking for a primer strike after firing one barrel. When I realized the problem was not a random experience I took it out to LDG & Son for repair. The gun had been restored by them in 2007 so the action was clean, the problem was a worn sear.
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