hi all first off im new to airsoft done my first skirmish just a couple of days ago, and am hooked lol. basically i want to get my own gun frieds already have ak47's so ive been looking at cyma ak as i can use there spare mags etc. basically the cyma's fps all seem above the 328 limit at our local club so how would i go about lowering this? is it just a case of a new spring? any info would be really helpful