MIL vs MOA are just two different units of measure when dealing with optics. MILs are based in centimeters and MOA is based in inches. There is a ton more information available as this is the simplest way to think about the difference between MIL vs MOA, so I would recommend doing more reading on the differences.
I would recommend emailing us at techsales@opticsplanet.com to help you further.
Vortex states their Razor HD Gen III 1-10x24mm 34mm Tube First Focal Plane Rifle Scope is daylight bright.
The Vortex Razor HD Gen III 1-10x24mm Rifle Scope is offered with either an MOA reticle or MRAD reticle. Both reticles would work for a rifle chambered in .223/5.56. However, MOA is preferred for targets at shorter ranges. MRAD is more precise and allows for quicker adjustments when you get out to extreme long ranges.
0.25 MOA on these.
Here is some great information about it https://www.opticsplanet.com/trybe-optics-enhancer-scope-magnification-doubler-w-tube-mount.html
This would work well with it.
The Razor 1-10x24 does not have a parallax adjustment and has a 150 yard fixed parallax setting.
The rear Vortex flip cap needed is E-10 and the front is O-24. According to the TRYBE website, the size needed would be O-44, but it is recommended to contact them directly for compatibility questions with their product.
The rings will be completely dependent on the firearm platform the scope is being mounted too. If the firearm has a picatinny rail, then the ring recommendation would likely be a set of Vortex Precision Matched Rings.