Will King Arms Drum mag fit the Cyma Thompson?
Hopefully someone will know, I have a Cyma 1928 with no mag 
Yes 
The King Arms and Cyma Thompson receivers are all copies of the original Tokyo Mauri design and nearly all parts are interchangeable with each other apart from slight manufacturing tolerance issues. You'll have no problem with the mags. I'm currently using a Thompson half made from a Cyma and half made from a TM. I've fitted an after-market/custom made 1928 style front end on it and also fitted a Kings Arms metal lower receiver, and it accepts all King Arms, Cyma and TM mags I have used in it (I have both a Cyma and a King Arms branded drum mags - I prefer the Cyma one!).
A Proud Member Of 'Team Spleen!' who play mainly at Gunman Airsoft, Tuddenham, Suffolk.
Thankyou
