On my .300 blackout SBR, I have a Kahles 1-6 which is one of the best, if not the best, of 1-6 scopes. I also have looked through the Vudu and Razor.
I recently built a .223 SBR and was looking for another 1-6 for that rifle. On Ilya's recommendation from this site, I bought the Hawke Sport Optics Frontier 30 1-6 on eBay for around $500 brand new. I am impressed!! It compares very favorably with the Kahles 1-6, which is almost 4x the price. True 1x with almost no distortion, superb reticle, generous eye relief, and glass quality that far exceeds its price.
While I probably will keep the Kahles, I have thought seriously about selling it, buying another Hawke, and saving the difference. The Hawke is that good!