Yes. This Trijicon MRO Anti-Reflection Device will fit the Standard Trijicon MRO as well as the HD model as they both have the same objective lens size.
No. The Trijicon MRO Anti-Reflection Device was designed specifically to fit the Trijicon MRO red dot sight.
It does not twist out.
Yes, these should fit the standard Trijicon MRO.
You'll need one specifically for the 4x32 ACOG.
https://www.opticsplanet.com/trijicon-tennebrex-killflash-anti-reflection-device-for-4x32-rco-acog-scope.html
Here's a flip cap that will fit over the ACOG ARD as well:
https://www.opticsplanet.com/trijicon-4x32-acog-objective-flip-cap-for-ta91-killflash.html
The MRO Scopecoat is made of a neoprene material, so it will have some stretch to it. The ARD minimal length, so you should be able to keep the ARD on and use the Scopecoat. The alternative option would be to get the ARD with Objective Flip Cap and use a lens cover for the eyepiece. I've been told this fits the eyepiece perfectly:
https://www.opticsplanet.com/vortex-strikefire-ii-objective-flip-cap.html
Yes, it will.
No, this slides onto the body of the MRO and does not flip up.