Are you sure your barrel is properly seated and locked into position? A&K is known for bad airseal. Assuming you have the piston/piston head sealed good with your nozzle... Every A&K 249 user that I know of, has replaced the hopup unit with a Classic army one, replaced the rubber, and tried various hopup mods to make the hopup usable.
I have a mod of my own that is better than the tinned wire solution. Not sharing
Quote:
Originally Posted by ThunderCactus
I make custom length steel air nozzles 
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Unfortunately, this is often the best solution for some models of guns *sigh*
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Do you know what ruins airsoft?
(Chair), (Drama), (Air), (Sugar) softers, filthy casuals
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Quote:
Originally Posted by mcguyver
it would appear I am not first up in this gang-bang
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WANTED PTW Receiver PRIME, STG, Factory