Ok, so I've done my research and all, but I'd like to get first hand info. I'm looking at the G&Gs, there more suitable for my financial situation

and I hear they're quite good. Is the accuracy of an M16 worth the extra bulkiness and length compared to an M4? The M16 I'm looking at already has a full stock for a bigger battery and the M4 doesn't. Does battery size really matter? I don't know how important these pros and cons are so that's why I'm asking for your advice.
Thanks.