APlus Airsoft DEVIL Hop Up Rubber for KJ / Marui / WE GBB Pistols

- Slightly narrow entrance for better sealing to achieve more consistent power output.
- Special pressure point geometry greatly improves hop up performance and more predictable trajectory.
- Suitable for Marui / WE / KJ GBB Pistols

NOTE: Due to special pressure point geometry, this product is optimized for use with inner 
barrels with open type hop up slot.
( i.e. Marui original pistol inner barrel and most compatible inner barrels )