Gun.deals - search for any model here and you'll almost always find the lowest price. Gen 1 Ruger Americans going for $350-$450. Throw a trijicon huron 3-9x40 on top and you're set.
Looks like warne has a direct mount in the style of sportsmatch and UM:
https://warnescopemounts.com/8514tm-warne-hyperlite-30mm-tikka-medium-matte-rings/
I'll second this for tall guys. I'm 6'6" and the K4 is far and away the most comfortable frame I've ever worn. I don't even have it maxed out and it fits like a glove. The lumbar pad is so substantial I get great lower back support which I need badly with my height.
I've used both UM and sportsmarch, and much prefer the UM. They feel more substantial but not with a meaningful weight difference. They are designed so that you can set the recoil pin in three spots to move it forward or back. The hardware on the UM also hold up better than the sportsmarch, I've...