R-Hop is the single most important part in airsoft that extends your effective range to over 60m/200ft. Max range of 90m/300ft can be achieved (with M130 spring, 1.7J). Package includes: R-Hopped Modify Hybrid 6.03mm Tightbore Barrel. An extra R-Hop. Modify Baton Flat-Hop Bucking. A S-Nub of your choice. Choose S-Nub for: Krytac, Prowin VFC & Lonex hoppus. IMPORTANT! Please note that due to the steel + aluminum structure, there are more occasional “flyer BBs”, compared to other one-piece TBB. Like our R-Hops, S-Nubs are made specifically for certain hopups. They just fit and require zero cutting. Moreover, you don't need to flatten the hop arm.