It will work on milspec barrel nuts.
MPN 156700 does come with a torque wrench. You can view an image of it on the Wheeler site.
https://www.wheelertools.com/gunsmithing-tools/wrenches-and-screwdrivers/delta-series-ar-combo-tool-with-torque-wrench/156700.html
It will not work with the Aero Precision M4E1 barrel nut
Yes, it will work for that
Yes, the Wheeler Delta AR Combo Tool With Torque Wrench can be used to change the muzzle brake on a Sig M400 556.
Yes you should be able to it includes a torque wrench to ensure proper barrel nut torque for maximum accuracy.
The torque wrench will measure up to 120 ft/lbs in either direction.
Yes, this will work with select barrel nuts for AR10 handguards.
Yes, this would fit the Aero Precision barrel nuts.
You are correct, however Wheeler does not list the torque range.
Please note that this is NOT a click-style torque wrench, but a deflection beam style.
Mark H.