You would have to downgrade the spring.
Get an M4, it's easier to downgrade and as you progress you can add bells and whistles to pimp it up. That and mags and vest's/gear is easier to acquire for the m4.
Though I would suggest getting AVed and waiting until you can check out the deals on the classifieds and the retailers here, it could save you a few bucks.
Cheers.
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