Chris they are all over the place but I will list them here for you. I think the distance between the beads is an important factor because if they are spaced to far apart it becomes difficult to focus on both beads at the same time.
30"=1 3/8"x 2 1/4"x 15"
28"=1 5/8"x 3 3/8"x 15"
26"=1 1/2"x 2 1/2"x 14 1/4"
Each of those guns lettered with two beads and were spaced at 18". The next gun did not mention a second bead in the letter and may have been added later. Its spacing is 16" from the muzzle.
32"=1 1/4"x 1 3/4"x 14 3/4"
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