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As I only own a CA25 and have only shot a G&G GR25, I can't tell you about the other two in terms of quality. What I can tell you is the CA, G&P, and A&K all use the same elongated V2 gearbox deemed the V2.5. The only one, which is different is the G&G, which uses a standard V2 gearbox, with an elongated air nozzle and a slightly modified gearbox external housing.
