I thought the same way until I tried it. It's likely not as fast as one close to the eye, but t does allow me to center it quite well, and the results on-target were quite acceptable. There are a couple of similar setups on the market, even for handguns. For my vision, it's better than an open sight.
EDIT: This is an expedient for rifles that aren't d&t for a receiver sight or, in the case of my Low Wall, where I was trying to have two sight setups for different loads available. Closer to the eye is better, but this works.
Last edited by Pappy348; 04/21/18.
