Originally Posted by wind_comm
as for modifying the barrel/patch, yes; it does have to be done to a certain extent. mostly just cutting and fitting then tuning the patch. depending on the manufacturer of the barrel, some fitting/fiddling with the hop window may be required. if you have needle files, an exacto/really sharp knife/wire cutters even, and a little sandpaper, it's easy as pie. the hard part is finding enough space to get it sighted in, so it'll probably have to be done at a local field.
Sighted in? Do you really mean to say that you just turn hop up/down until you're happy or is there more to it than that?
Did you mod the R-hop to fit in your barrel or the other way around?