I am looking into getting a red dot sight to use on a Ruger MKiii and a Smith and Wesson 15-22 that I plan on acquiring in May. Once I get into larger caliber guns I'll most likely use it on them as well. My question is what qualities should I be looking for in a red dot style scope? I see them ranging in price from $29 to over $700; what justifies such a difference?
Clearly the $29 ones are plastic and the $700 are metal, and I'm sure the more expensive ones have better quality lenses and most likely longer battery life as well. But what key characteristics should I be looking for in a red dot sight? Why are some open on top (http://www.opticsplanet.net/barska-electro-sight-red-dot-sight-ac10632.html) and others are closed (http://www.opticsplanet.net/barska-2x30-red-dot-scope-ac11090.html)?
I don't want to spend more than $120 and I want a 2x red dot sight.
Thanks
Clearly the $29 ones are plastic and the $700 are metal, and I'm sure the more expensive ones have better quality lenses and most likely longer battery life as well. But what key characteristics should I be looking for in a red dot sight? Why are some open on top (http://www.opticsplanet.net/barska-electro-sight-red-dot-sight-ac10632.html) and others are closed (http://www.opticsplanet.net/barska-2x30-red-dot-scope-ac11090.html)?
I don't want to spend more than $120 and I want a 2x red dot sight.
Thanks