Answered my question finally with little more research.
Found at my target price in Canada and order placed.
now waiting!!!

Will be using a TM G18C inside of it and another one outside of it.
This way, only one type of mag to carry.

Hijacking the thread a bit, does anyone have any experience with the P226 version of this kit?

I recieved my RONI and its awesome BUT I found the cause of a little wobble that I dislike.
The rear of the grip is a little bit loose and I'm able to press it (to close the shell) perfectly by squeezing it and the wobble disappear.
Like in the picture bellow
http://i473.photobucket.com/albums/r...2/IMGP4754.jpg

Did someone has the same problem?
I actualy find that using 2 ty-wrap around the shell between the fire selector and the cocking handle works to squeeze it snug but its not the best looking modification.
I tried with the stock grip and its the same so the problem is not coming from the Guarder grip being different or not.
It's the opening part that looks to have a little flex being not reinforced enough or maybe a flex created when unmolding the part in production while cooling.
The gap is there even if there's no pistol inside.

For the fire selector I dremel a bit and its just perfect like this:
http://i473.photobucket.com/albums/r...2/IMGP4753.jpg

Thanks to share if you have ideas.