Spyder Imagine with Smart Parts Progressive Barrel, VL revolution with Re:Load upgrade kit, Derlin open face bolt, Check It Flat trigger, 68 CI/ 300PSI PMI nitro tank.
Everything. The feeding rate is soo fast, it is faster than the 12v revvy. Since its sound activated you cant go wrong and it responds faster than the revvy censors. Also, since it is sound activated if u chop a ball, on the revvy it could cover the cencors causing the loader to stop, but with the re:load it wont stop anything.
nothing really, sometimes the hopper goes off if someone shoots it near the microphone. also it is kinda pricey but its worth it.
I think that this upgrade kit is an over all good buy, i would recommend this for anyone who doesnt want to spend money on another hopper if they have a revvy already.