The "three coloured ring" system works fine if you're using it as a basic short range hunting scope. I have one on a 17hmr but for medium ranges a MOA dial in combination with a range finder & decent ballistic app is far more precise & user friendly.
They are a great light weight scope, limited elevation adjustment as Tahr said but plenty for most sensible hunting situations, I have a couple, ones on my light weight mountain gun & it's a great scope, but beware their light weight comes at a price, they won't handle the NF test & are very long. But I still rate them & the 4W reticle is probably the best hunting cross hairs on the market.
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