As some of the other esteemed Forum members have stated, 400 is normaly the Limit for most Playing fields for AEG´s, some do make compensations for the different roles and types of guns, Sniper, Sniper support, MG´s and so on, also depending on the type of game, open woodland, CQB/CQC, Trench, ASLARP, True Mil-sim.
I would reccomend that you check out your local playing field restrictions first, then make adjustments from there. You may also want to check to see if they have reserved days for Players with thier own Load Out, some fields drop all restrictions on `` Reserved Days ´´.
Don´t get caught up in the trap of trying to slip through the rules by using heavy weight BB´s during Chroning, a field might let you slip through, but if you get called for a `` Hot Gun ´´, you will be re-chroned with .20g, then you are S.O.L., and will be labeled a Cheater or Highlander.