Fits Perfectly on MAC9 DS COMP
"The Osight X fit perfectly on the AOS Plate that came with my MAC 9 DS Comp 4. 25. Used stronger aftermarket 4-40 x 1/4" screws with the appropriate thread locker and your set. I will purchase another one in the near future, as this is my 2nd one from LA Police Gear. It was new and sealed in the package and shipped quickly."