Depending on what ammo was used, the MK103 had a rate of fire from 380 to 420 r/m, not 65 r/m.
The MK214 was a 50mm weapon and certainly larger and heavier than the MK103. Did you mean the MG213?
Here is a web site on the MK103,
http://www.deutscheluftwaffe.de/arch...inenkanone.htm