So really what you're saying is, "I'm cool with registration as long as it's not registered to me." Go through an FFL and get the government's permission to allow you to exercise your rights. That way your ass will be covered.
I like the DMS for what it cost. It's been durable. With just a circle reticle and a dot you don't have much to work with for estimating holds. How far you can hit with it is up to you. I think the Appleseed folks say you should be able to hit a man at 500 yards with iron sights.
Gotcha. I didn't know if the mid-length MOE required modification to fit on the M&P 10.
I'm on the fence about selling a sweet custom 6.8 upper to fund a new M&P 10. If anyone is interested in the 6.8 let me know.