Contact Mike Bellm, he has hinge pins. There wasn't two different Armour Alloy frames, only one. As mentioned, the plating was the only issue with the barrels and i opened up my share as well. If i were you, id open the frame and barrels to accept a common hinge pin and enjoy it. The AA guns don't bring a premium over stainless guns. In fact many steer away from them due ti their proprietary nature.