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The Meprolight M21 Day/Night Self-Illuminated Reflex Sight carry handle mount will work with an A4 Detachable Carry Handle.
No. The Meprolight M21 Day/Night Self-Illuminated Reflex Sights carrying handle option is not removable. You can find this optic without the carrying handle mount using the following link.
https://www.opticsplanet.com/mako-group-self-powered-day-night-reflex-sight-w-dust-cover.html
The polarizer kit will allow you to see the reticle under all lighting conditions. Do not use an aftermarket illuminator. It will void the warranty and can damage the optic.
11 MOA high and 13 MOA wide
Yes, it is a carry handle mount.
The reticle options are listed. Two of the options are different size dot reticles and the other is a bullseye reticle.
Yes, it can. The first link below is the M21 with the picatinny mount. The second link below is the picatinny mount by itself.
https://www.opticsplanet.com/mako-group-self-powered-day-night-reflex-sight-w-dust-cover.html
https://www.opticsplanet.com/meprolight-m21-picatinny-rail-adaptor.html
No, it does not. The first link below is the M21 with the picatinny mount. The second link below is the picatinny mount by itself.
https://www.opticsplanet.com/mako-group-self-powered-day-night-reflex-sight-w-dust-cover.html
https://www.opticsplanet.com/meprolight-m21-picatinny-rail-adaptor.html
The reticle color would be yellow/orange.