sending the valve in for repair

[paintball man 222]

how would i go about sending back the valve for repair, my bolt double shoots for no reason. do i need to send the whole gun or just the valve. i also bought the gun a few years back used, so will that pose a problem?
thanks for your help

[Dayspring]

Check your sear assembly. It could be worn and so could your bolt. This could cause that condition to occur.