Red dot optics and magnifier combinations must have the same central height of the lens to cooperate. This magnifier requires a flip-mount that is a 30mm mount with the same central height as the red dot.
Determining compatibility between red dot optics + Magnifier combinations is dependent that both optics have the same central height. This means the center point of the lens is placed inline with the center point of the red dot. There are several mounting solutions on the market for rising and lowering both the red dot and magnifier. The central height of the Lucid HD7 with the mounting hardware included is 1.75 in, so you will need to find a flip-mount that will place the magnifier inline with 1.75 in.
The Primary Arms 6X Magnifier (Gen II) has been discontinued by the manufacturer. Any magnifier will be compatible with your TRS-25.
These optics were not designed to cooperate and we do not have sufficient information on this pairing to offer an honest answer.
Yes, it will and you will just want to make sure you are ordering the correct height mount for your setup.
Any standard lower 1/3rd co-witness height mount should match up and if you want an exact height, you should be looking for a mount with a 1.6" optical center height. Here is the Primary Arms option:
https://www.opticsplanet.com/primary-arms-primary-arms-flip-to-side-magnifier-mount-standard-height.html
There are also many others from many other manufacturers.
That is entirely dependent on what mount you have on your 503G. Assuming you are using the standard high, lower 1/3rd co-witness mount you will want something around a 1.6" height.
As long as you have a mount that lines up in terms of height with your Bushnell red dot, then it will work. But you need to confirm the height of your red dot from the top of the mounting point to the center of the red dot window and then find a magnifier mount that matches that height.
Yes, but note the mount you choose is capable of interfacing with the 30mm ring on this magnifier, because the objective is larger than the 30mm mounting area. Mounts intended to just slip over a 30mm mounting area and tighten down will not work.
This optics does not include a QD mount.