I have one of Jackie's earlier tuners, and it extends beyond the muzzle about and inch...total length 3". Looking at pictures of the current version that has part of a marine cutless bearing pressed over what I have, I would say that it has slightly over 1/3 of its total weight in front of the muzzle. I also have one of Gene Beggs' tuners. When you move it, things happen. The point isn't how they look, or whether their style conforms to any preconceived notions, but whether they work. It would seem that there is more than one way to skin this particular cat. Lou Murdica has spent a fair amount of time testing tuners of various configurations. What he currently is similar to the Beggs (very well made by Ralph Stewart), a little lighter, and on his 10.5# bag gun(s) it sits with about half of the thickness of the front disk overhanging the muzzle. I have seen the targets that show how he tunes his rail with a larger, heavier version, proportioned to the larger barrel. It doesn't take much of an adjustment to fix a little vertical. Personally, I think that once you have about the right amount of weight, in about the right position, you can finish the tune by adjusting the load, and from their make further adjustments with either the load or the tuner, or in extreme conditions both. Of course if one is preloading, one is limited to adjusting the tuner, unless he has come to the match with more than one load.
