Can anyone tell me what this is/for?

I don't know what the heck that is...
I use mine for loading bullets in magazines, as I am missing a thumb it works just great.

I'd like to know what it really is - I'll just follow this thread and hope someone comes up with the answer.
 
Can't believe all the above posts - they are all wrong.

Its an accuracy enhancement tool. You put it on top of the rear sight (with duct tape or velcro straps if you want to go all out).

Now you have a little "window" to look through to focus all your attention on the target and to block out all the surrounding distractions.

Much better than a scope or Eotech/Aimpoint.

Try it and see.
 
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