How to R-hop an airsoft barrel

My R-hop method. Minimal effort for perfect patches :) Tube is 6mm ID, 10mm OD, 60 Shore, platinum cured silicone tube - I get mine from eBay : http://www.ebay.co.uk/itm/PLATINUM-CU... The RTV silicone sealant is optional, but will help get a perfect seal between hop rubber and barrel. The ring was cut off because it was a VSR rubber being fitted to an AEG barrel (as the Action Army VSR chamber can take any barrel).