Well have to go double stack like the AR 7.62x39 mags they are not any longer then any other 10 round mag only lame companies use single stack mags because they suckHAHA especially for a scout / ranger / carbine platform like come on people ! come on !
To fit in the current mag-well and maybe therefore receiver one would have to utilise a double to single stacked magazine which is very difficult to make reliable from what I understand. I don't know if the strong taper of 7.62x39 would make it even harder.
