ER-hop kit from HS Armory. The R-hop variants are the ultimate hopup system, not only greatly increasing accuracy, but also range at the same velocities. These patches distribute the pressure on the BB better than any other system available including flat-hops and any after market bucking. These are extended versions of the classic R-Hop patch, allowing long, even backspin of any weight BB. Please note that your barrel window will need to be installed to accommodate the longer patch!
Contains two patches to allow for experimenting and multiple installs.
If you live in a cold weather area, the IR-Hop is recommended, as it is very resistant to temperature change.