This is debated for so long and its whatever the game organzer put it.
Personally, if the AR (automatic riflemen)'s is running a non-belt fed but magazine fed gun, I expect the the inidividual to run standard magazine -just allowed to carry more.
The USMC's M27 IAR runs on 30 round box magazne, the AR just carry more standard standard trooper.
This would also work on MG36, AUG-HBAR, L86 LSW, M27 IAR (an M27 w/ bipod not hk416, there are some differences), RPK, RPK-74
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