Am I reading this correctly then: The XCR uses a selector spring in the exact same location, and utilizing the same hole in the top edge of the grip, as an AR15? Does this also mean that there is a detent in there that can go MIA if you are not careful? Thanks.Take the bolt out. Slip the grip off, while being careful not to lose the selector spring (it will jump out if you're not prepared for it).
Slip the MIAD on with the selector spring in the proper hole (careful--don't kink the spring). Screw the bolt back in. Done!
I didn't bother with the alternate frontstrap. That gets a bit more complicated.
For anyone else that wants to install a MIAD grip. I would recommend using the hex head screw that is on your rifle. Not the slot head screw that ships with the MIAD. The slot head screw that ships with the MIAD is treated with some type of thread lock. It is hard to get started & I would be concerned with cross threading on install. A long handled hex driver is very handy for this modification.