The G&G L85a1 had a standard rail, and could take you regular aimpoint or ACOG sight. All I did was take the rail off the gun (a couple of screws inside the upper reciver, no biggi) and then work it down with an electric drill with a sander on it. I stoped ever so often to see how mutch more I needed, and in the end my STAR SUSAT went on like a glove. I will guess it will be the same here. Please keep in mind that it will then most likely only holde the STAR SUSAT....