For better performance of the hop-up chamber, Airtech Studios developed that R-Hop and Flat-Hop Tensioner Nub Set that can be found at Airsoft Atlanta... "The first version is used for RHOP setups for the optimum amount of push onto the patch and BB. Secondly, the nub is used for Flat-Hop setups. Both are designed for low stress and high performance to increase the accuracy and performance of the hop-up chamber.

CORE FEATURES

• Enhanced BB flight path in a long straight line by utilizing the increased contact point on the hop versus BB.
• 2 Pcs included for RHOP and FLAT-HOP setups
• Can be used universally for all AEG hop-up chambers of different brands and models."