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High grade tends to mean higher quality and/or wieght of the plastic the guns are made out of. TM springers, heavier wieght. KSC GBBs, such as the Glock 19, means the frame is made out of a heavy plastic that has metal powder mixed into it. Basically it means more realistic feel & wieght to it, rather than a magless pistol feeling like a water pistol.
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