Crosman barrel assemblies

I have swapped stocks between NP1 Crosmans a number of times without any problem - pretty much drop the action in and tighten the screws. However, I found that swapping stocks between an NP1 and an NP2 does not work due to differences in the cocking assembly and trigger configurations. Admittedly, I was swapping entire actions from one type to another (or hoping to), and not looking to swap just the barrel and breach. On the other hand, to make this work you'd still have to figure out how to fit the cocking assembly (arm, linkage) and the NP2 trigger assembly to the upper breach and piston. A trained metal worker might could pull this off but not a garage scut like me.