I came upon a question when i was upgrading my M4. And that question is: Will a Tokyo Mauri M4 Gear box work in a CA M15 body? Also will the CA hop up work with the TM gear box? Or other way around would a TM hop up work in a CA Body?
check some of the old threads. use the search feature. had this same problem when i did this swap. had the old style ca body. transfered the gearbox, hop-up unit, barrel, motor and etc. had a feeding problem and it wouldn't fire in full auto. bought a one piece hop-up, dremel the lower and quite a bit of demeling and fitting. be prepared for alot of work. "pm" me and i'll give you some hints.
Thanks for the reply, and thanks for the offer on help. I had a feeling this would be a lot of work. I think ill stick to a Aftermarket body. Althought a bit more expensive its worth having less troubles. thanks again.