The RS2 is a fly that is so simple yet works so well. Its one of those flies that is in a league of its own and there really isn't much that can replace it for given situations. For instance, I used to fish the San Juan River a lot. Small midges were on the menu for the trout there. And when I say small, I really mean small. We are talking size 24-30, even smaller in some cases. There is only a hand full of flies that can be tied down past a size 24, and the RS2 is one of them. It in itself has caught me a number of really nice trout on that river.
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