ok im looking at the hfs-omm rx but it says it has only 3 amps bec so in return will that have a affect on slowing down the rx. please explain thanks

The BEC is only in the battery port of the receiver. So if you are using high torque servos in the channels, the BEC will only allow up to 3 amps of current draw from the servos. If you exceed this current draw the servos may act intermittent until the amp draw returns to below 3 amps.