The Nine Ball Reinforced Piston for MK7 is a lightweight and very strong polycarb piston. Polycarb pistons are great for keeping a lightweight power train that won't damage the gearbox shell, but at the same time remain strong enough to hold up with mild upgrades. Laylax has some of the best R&D in the industry, and this is one of the only upgraded pistons available for the Tokyo Marui MK7.
The use of aftermarket airsoft parts is not an exact science. Some parts may require fitting even thought they were designed to fit without modification. Professional installation of upgrade parts is highly recommended.
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