I originally looked at Murray and the V17231 also, but choose to use someone who made a belt and sheath for a custom knife of mine.

I used a leathersmith from Hope, AR named Kenny Rowe. he does perfect work in his shop with his son. I recently used him to make a special sling for my new custom rifle that fits the extra length of pull [15 inch]and the fact that the front sling is on the 25 inch barrel.

Just send his a picture of what you want and $50 later and a couple of weeks and you got a perfect sling.

http://www.rowesleather.com/