By the looks of it you got the blue ones, they are a match for the CTW, the black ones are a direct match for Systema Gen3 and the purple are also based on Systema but slightly different. Brad is right no matter what you system you choose in the end it will run you more than teh cost of the whole gun and another issue you will face is the motor if your motor is teh exposed core version you might want to look at a new motor to go with the new electronics.
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