Ghk m4 should be the best skirmishable gbbr m4 out of the box. The magazine gas system is made out of magic!
Else, AEG I'd say vfc as well... it looks better and more accurate than g&ps and shoots just as good. Very accurate guns but if you are wanting to upgrade fps and rof, you might run into some problems. G&ps are easier to upgrade in that aspect. Usually I just run VFC aeg with an upgraded tightbore barrel and hop bucking and leave the rest as stock till it breaks.
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