I do think you've hit the nail on the head when it comes to upgrading the M14 - the airseal.
I left my piston/pistonhead assembly completely stock in my M14, and with a prometheus ms120 I'm only clocking around 410 right now. Obviously there is room for a huge improvement in the stock marui parts, and I'll be ordering replacements next time i'm browsing WGC. Thanks for the post!
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