Get powerful, accurate shots with the PDI W Hold chamber packing. This hop up rubber improves air seal over stock buckings and makes for a durable and easily adjustable hop.

• Centre cut mound for more shot to shot consistency
• Two moulded outer rings for improved airseal
• Oil and abrasion resistant
• Effective in lower temperatures
• Material: Nitrile rubber
• Fits: AEG style inner barrels

Recommended Hardness

• 50° - up to 0.32g BBs and cold weather performance
• 70° - over 0.32g BBs (not recommended for cold weather use)

Installation notes:

• The dimensions are designed to be tight, some light lubrication may be required on the outside during installation.
• Trimming may be required to fit some hop units (TM M14: 6mm / NGRS: 2mm)