About this sight both me and my father used it on two different rifle a semi-auto ruger 44 mag and a semi auto 30-06, and it don't give us any trouble.
We use the same sight before mounted on a rifle and after mounted on the other.
In this kind of this sight take a look of the Docter Sight III:
http://www.docter-germany.de/en/products/prod/prod/doctersight-iii.html
Or take a look of a tubular red dot as Aimpoint H1Micro or H30.
As dracb said this kind of sight are for close range shooting if you have to shoot more longer than 70-80 yards on small animals, in my opinion take a low power scope