This PDI hop-up bucking, or PDI W-hold chamber packing, is designed by PDI for accuracy and consistency. PDI's hop-up bucking is suitable for use in AEGs, as well as in PDI sniper rifle hop-up units.
PDI has added two external ribs to increase air seal, and the internal V notch for accuracy. The material is softer for increased spin. The PDI Bucking, or Hop Up Packing, is compatible with airsoft AEGs. It is also compatible with bolt action airsoft sniper rifles in conjunction with a PDI hop up unit and an AEG type barrel.
-PDI Sniper Rifle Hop Up Unit Compatible
-External Ribs for Air Seal
-V-Notch for Accuracy