I was planning on doing it myself, but I found out the differences, These prefixes indicate specialized R-hops. I stands for “ice” and indicates cold weather tolerance, so the IR-hop works in effectively all temperatures. It technically can be frozen, but everything else in your gun would have failed long before the hop. E stands for “extended” and indicates a special longer patch just slightly less than twice as long as an R-hop. These improve performance beyond the regular R-hop. IER is obviously a combination of the two, and is an extended cold tolerant hop. The Z-kit is a three piece set from the ice hop line designed to ease installation.
