Airsoftjunkiez got another HPA engine to review, the Protech MK 2.5... "Airsoftjunkiez.com take on the new Protech MK2.5 Direct drop in Engine kit that replaces the internals of an AEG gearbox to convert it to a HPA setup. Features the only Patent pending air brake to allow soft loading of the BBs for more reliability and consistency."
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