MR Silicone Hopup Rubber for Marui / WE GBB & VSR ( 85 )

●For GBB/VSR10 spec inner barrel and without modify ●Anti-frozen silicone material ●Stainless c-ring included for tight sealing. Optional installation. ●Larger & wider contact area inside of BB pellet, has better hop effect with heavy BB ●For Heavy BB pellet only ●The "Shield" shape groove design has better hop effect when tensioner/lever press it ●Retain the steel "C-ring" design for airseal from "Transformer HOP"series The R-hop Rubber kit begin from a small group user who want to increase the range and hop effect of heavy bb. The title "R" mean the "RANGE". But it need modify the original AEG hop rubber and stick the rubber patch by userself,  so it not easy for everyone and need some airsoftgunsmith technique for that.