Solenoid Actuation Circuit for Hocky Robot - High speed, Maximum force
Given limited details, I am assuming that receiver is something similar to Spektrum AR610 receiver. These types of receivers don't output high/low digital signals (at least, I couldn't find reference on how it could be configured this way). Instead, they output a pulse signal used by servos to drive servo horn position.
I doubt 12Vdc will provide enough force to quickly launch hockey puck. Suggest driving solenoid (o at 24Vdc and using capacitors to store energy required. BattleSwitch or Picoswitch allows for relay functionality from receiver channel ouput. Example schematic shown below: