HS515CM is slightly lighter, at 3.53 oz. But other than that they are basically the same sight.
This is a red dot with no magnification. You would need to get a magnifier if you wanted magnification.
Yes, the center riser can be removed and you can use just the base to make it a low mounted red dot.
No, this is a red model.
The Holosun Military Grade Micro HS515CM has 2 night vision compatible brightness settings that can be used in conjunction with night vision optics. The Holosun Military Grade Micro HS515CM is not a night vision optic itself.
The Holosun HS515CM utilizes a QD(quick detach)picatinny mount. It will mount on any standard 1913/picatinny rail without issue.
The Holosun Military Grade Micro HS515CM has a Aimpoint Micro Footprint. Meaning it can use all T1/T2 style mounts. I would recommend the Midwest Industries T1 Absolute cowitness mount found in the link below. There are also many other Absolute cowitness mounts available for the T1 footprint.
https://www.opticsplanet.com/midwest-industries-t1-t2-red-dot-optic-mount.html?_iv_code=MWI-RMT-T1T2RD-MI-T1-CO&_iv_co-witness=absolute
Yes, this will work with any T1/T2 mounts.
Yes, you can replace the mount with any T1/T2 mounts.
he AKML AIMPOINT MICRO MOUNT states it is compatible with Holosun sights, but this optic includes picatinny mount.