so converting and staying same primer size, i.e. small pistol to small rifle. is easy. 1 bolt for the tool head, loosen 4 remove the spring, loosen 4 for the shell plate hold down, pull shell plate up, change case feeder arm, re-assemble change case feeder plate .... 15 minutes max since you will be also lubing and cleaning the machine a bit if you are disassembling a bit.
i have not down a primer conversion yet, when i installed my primer orientation sensor i had access to the primer system, and from just looking it over it didn't seem overly complex, but if you join the mark 7 group on facebook i am sure there is a video on the conversion