Remove the barrels; can you make the left trigger move by moving the right trigger?
Place a tongue blade or soft wood against the standing breech; a dent in the blade will indicate hammer fall. Can you make the left hammer release on the wood by bumping the butt?
A lot of doubling is caused by dirt/grease buildup between the trigger extension blades.
Wear on the left sear may cause a double on recoil .
Best, Austin
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