The Prometheus Hop Up Flat Straight Chamber Packing Blue Bucking works in AEG airsoft guns. The smooth bore is unique and requires a bridge (Flat Hop nub) to function perfectly. Great for heavyweight BBs. Very popular seller and well liked by pro-players. Excellent new high quality product from Prometheus in Japan!
This is the bucking to use in AEGs if you want to flat hop your airsoft gun. Requires an additional nub (Firefly or Prometheus) to flat hop it.