I have one of your AR10 (DPMS LOW) rails on my S&W M&P10, and it's great. It's the early version before you added the new style locking plate and barrel nut, so I drilled and tapped two holes for screws to secure the rail to the barrel nut.
Anyway, looking at your options, they are essentially the same rail, just with the new style hardware. Any plans to bring out a slimmer AR10 rail? This one is 1.75" OD, it would be nice to have a 1.5" OD option.
Thanks!