250ft head shots at 350-400fps in an m4!!!!!!​What is the R hop? The R hop is a specially design hop up system designed by HunterSeeker which has revolutionized the airsoft world. The system starts with the contact patch which requires slight modification and tuning to fit inside the barrel hop up window cut  and to apply the proper amount of back spin. The next step is to remove the internal nub on any bucking and sliding it over the fitted contact patch. this system allows for the back spin piece and air seal piece to be completely separate so choose the bucking that seals the best for your gun. Now, with the system installed the hop up will only need very small adjustment. It is HIGHLY RECOMMEND TO US .28g BBS OR HEAVIER.
This particular version is called the Ice R hop be(IRhop) cause it can work under extreme whether conditions making it perfect for use in gas powered guns. The R-hop Requires some DIY skills and can be time consuming but the results are worth it. here is a installation Guide 
Pre-tuned barrel kits will also be aviable

Package includes 3 contact patches

Features:
properly tuned is cable of reaching out 250ft with great accuracy
able to with stand could temperature without loosing performance,
Can make cqb weapons field ready,
can greatly increase range of low fps guns
seperates airsesl and contact parts
creates more even and extened backspin similar to the firefly bucking but better


Disclaimer the R-hop requires a lot of tuning and testing to get advertised results and require .28 or heavier