Saw a second generation Parker dbl bbl. origionally with two triggers. One of the triggers appeared to have been cut off almost flush with the receiver enabeling one bbl at a time to be fired using the single trigger. Can this be converted back to a dbl trigger setup using parts from a spare receiver or has this single trigger alteration complicated things? Thanks. P.S. The single trigger doesn't look like a Parker trigger. Would appreciate your professional thoughts as I've given the seller a deposit and now have limited time to come up with the funds to pay for the gun.