Used to use a tru fire buckle, but after hunting in the rain it became unreliable... The shop I frequent did everything they could think of, but to no avail. Still wouldn't function smoothly.
They all shoot the Tru Ball Copperhead with velcro strap. I borrowed one for an outing of shooting. Bought two, one for me and one for my wife! I hunt in all weather conditions and neither one has failed us yet... My favorite realse yet, and they redesigned their strap last year so adjusting length is much easier.