The Modify Ryusoku Flat Hop-Up Nub is a great addition to most standard hop-up units for those who want to flat hop, R-hop, or S-hop their rifles. This nub requires no modification (but easy if needed) to the hop-up arm, and is a drop-in nub for almost all the hop-up units in your AEGs and GBBs, making it easy to give your airsoft replica a hop modification.
To improve the Flat Hop-Up Nub, we first made the Nub thicker and combined it with a new mixture of ingredients. The new design not only enables finer-range adjustability of BB's trajectory but also achieves consistent Hop-up pressure. We recommend using it with our Flat Hop-Up bucking but it is compatible with all Marui spec AEGs.