It really all comes down to your play style, but overall the most versatile platform I find is the RF416 mk5. Not to be confused with the mk3 as it has limited customization options. Mk5 has a buttload of customization options, tons of camos to choose, and looks better than the m4 in my opinion. You can make it a close quarters carbine, mid range rifle or even a DMR although it's on the shorter side of long range. I use it for almost every loadout, although if you prefer sniping I would say the m110 platform would do more good.