R-Hopped Elvish Tac 6.03mm Stainless Steel Tightbore Barrel 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 E-Tac 6.03mm Tightbore Barrel. An extra R-Hop, Modify Baton Flat-Hop Bucking, A S-Nub of your choice. 7 Lengths to choose from: 300mm, 340mm, 363mm, 380mm, 407mm, 455mm & 509mm. E-Tac 6.03mm is designed for R-Hopping, with an enlarged Hop window. The groove is extended to indicate any possible barrel rotation, which can send BBs to left or right. Now you can check the alignment of the barrel without disassembling the hopup. Air seal will not be affected. Choose S-Nub for: Krytac, Prowin VFC, Madbull, G&G, & Lonex hop-ups. 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.