There are 2 sets of hammer & sear for each barrel. The engagement seens light? A gunsmith should be able to file the contact area to make the trigger pull heavier. Depends if surface hardened or fully hard. Dont want to file away any surface hardening, if any still remains.
The recoil from the first shot is dropping the hammer on the 2nd barrel. Very dangerous.
You can measure the trigger weight of each, with a gauge. My guess, but could be other issues?
https://www.gunpartscorp.com/categor...guns-sav/bse-d.
The gun may fire when closing the action.
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