I have a Parker, all parts are original and have not been altered. Trigger pulls are 4 1/2 and 5 lbs. The owner says it doubles so I test fired with factory ammo in the right bbl and just a primed shell in the other. Fired the gun and it did not double. 3 shots out of the right bbl and it finally did double.
Took the receiver out of the stock and reassembled, cocked and banged it around with a plastic mallet and the left hammer held no matter what I did to dislodge it. Anyone have any idea why it would be doubling?