Pistol optic, eh? I think you're into real steel only. You've got to have quite a bit of extended eye relief (the distance your eye can be from the lense) to be able to use it on a pistol properly.
Unless it says hangun scope/optic (or better yet lists the eye relief...rifle scopes will be ~2-4" or so...pistol scopes will be 16-20")...don't just go for what looks like it might work. Two of the items in your first post are rifle scopes...with small eye relief.
Also...you want a pretty large piece of glass....not a little skinny tube (which is cheaper). 20mm is pretty small...and at arms length won't be all that helpful. 26-28mm doesn't sound much bigger...but it makes a difference. I think the largest common ones are 32-36mm?
Tys
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