I know that Fowler here on the board has one and seems to like it very much. I've seen his and it seems very well constructed. Mike Barranti makes a nice one also called the NW Hunter rig. I have one of his and love it for hunting just as another option. The turnaround time is not as fast as Ringler's though if that matters

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"Better to Remain Silent and Be Thought a Fool than to Speak and Remove All Doubt"