A saying : Why fix something that's not broken?
Even tho if G&G Compression set sucks, they still run good.
And heavier BB's will affect accuracy and reduce the wind effect on the BB's.
Also, modify piston, piston head and cylinder set are great, but you could wait a bit till your gun has some problem before "upgrading" it. Stock they already perform well.
And 007airsoft would be a wiser choice then buyairsoft.
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