Just picked up another Armson sight (that makes three I own) and I love the new design they are manufacturing now. The clamp is more toward the front of the sight, instead of being centered as they once were. This makes it easier to fit in tight spaces.
Here is a picture of my three 'Mags and my Sniper II. All three Armson's are pictured. Note the Armson on the Micromag...it is the new design that I refer to above.