I've run a ton of optics on the 17. Started with a mark 6 1-6, and wasn't super impressed with it. Its best feature was its lightweight and 1-6 ability. The glass was ok, the locking turrets annoying, the red dot would dissapear if you weren't directly behind it.
Decided to test the scar as a Dmr since Its a 1moa rifle. Mounted the vortex razor gen 2 3.5-15. While it's a great optic, it's way too heavy for the scar. I decided that I wanted my scar to stay light and mobile, and be able to hit man size targets in the rolling hills of West Virginia, where the longest shot is 500 yards.
I then went with a Schmidt and bender 1-8. That ended up staying on the scar for a while. high quality optic, excellent glass and turrets. My issue was the tiny reticle at one power, since it's first focal plane, it's also super expensive, and not great in low light. Also I wanted to be able to transition faster from low to high power.
My solution was the acog ta11 and rmr. Cheaper than most 1-8 optics. Works better in low light, simple and fast with no need to change power. The glass is 3.5 which is fine for man size targets up to 500 yards. The rmr is piggybacked on top, which means that you need to use a check weld. Not a big deal at all.
my only concern is my rmr breaking from the recoil impulse if the scar. In the meantime, I think I've settled on my optic set up.