It would be a good idea for them to play around with the CM when you get it and see how they like it.
I wouldn't recommend going AK's if you have an AR-15 platform, mainly because the gearbox is different, making learning process of teching difficult, and because mags are different, so gear to hold them would probably be different.
As well, an M4 CQBR (with a nylon fibre shell, not metal) would work quite nicely for them, seeing as it's (relatively) small, light, and is completely cross-compatible with your CM. M4 CQBR's are similar in length to an MP5SD.
Maybe get a JG G36C and a magwell adapter, although it's fairly heavy, but I think the best option is a nylon fibre M4-CQBR.
My 2cents.
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