I thought the M-300 Patrol would be great as a clip-on too, due to it small size and light weight, but it is not collimated to any day optic lens either and has to be manually collimated following the same instructions above. The internal reticule in the M-300 is also very thick and will cover your target making precision shoots next to impossible. The only thing I would recommend trying with the M-300 Patrol is trying to set it up with a 1X Eotech or a 1X Aimpoint red dot holographic sight.
Another problem was with both my Elcan and ACOG being used as clip-ons with the MKII or the M-300 Patrol is that anything over 2X would obliterate the icons you need to see to be able to use the scopes, ie all you see is your day optic reticule and cannot operate the scope settings using the icons.
What is worse, is that once you have it collimated on your rifle to your day scope, if you move it as a clip-on to another rifle you have to do the same thing all over again, ie you cannot just collimate the IR scopes once and they are GTG, you must do it each and every time you move it to another rifle setup. I found that once I had them dialed in as clip-ons after many rifle rounds down range getting them dialed in, they were at best 3-4 MOA setups, where using either of them as a standalone thermal scope was closer to 1 MOA.
Plus, there is no X,Y coordinates to to refer to or write down or store.
For me, it was just too complicated to use either of them as a clip-on compared to all my other thermal clip-ons that take about five seconds to attach, turn on, and shoot since they are already collimated to day optic lenses.....
You can certainly go ahead and try it out on the MKII or the M-300 patrol, maybe you will find that you like it? I found that after taking the time trying them out as clip-ons, I decided I would use them as standalones only.