Just got a Hera and I really like the trigger action. I have the rival battery pack in. Why isn't this more popular? I know perses etc. But still. It just runs
NERF Rival Prometheus Review - the MXVIII-20K Under The Microscope
This battery pack brings Nerf guns into the modern era - CNET
Amazon.com: NERF Rival Rechargeable Battery Pack : Toys & Games