Just got my first package today from LaRue! My question is this: What do I need to use to get the surefire OEM mount off the M300A so I can install the LaRue LT-172. None of the allen wrenches I have fit the screws on the side of the SF mount. Does it require a torx bit or allen wrench and what size?? I guess I have to go buy one tomorrow so I can install the LaRue mount.