there shouldn't be a ratio. if the optic sucks it doesn't matter if the gun cost 10k. I could easily see putting a $1000 zeiss v4 on a $399 ruger american. rather look at the intended use. also look at how often you use that gun. or a $300 elite 4200 on a custom rifle that cost 3k. there might be a use where that is just fine too.
