This is my first post but this forum seems professional so here goes...
I've been toying with a Colt LE 6920 I want to buy off a family-friend with Mako drop-in rails and a Surefire M961XM07 rail-mountable flashlight. The problem I have is that the Surefire, when mounted on the rails, is loose, even when trying the light on all 4 sides of the rails and ensuring that the light's screws are completely tightened. There is a non-Mako gangster grip already on the rails that secures tightly. What rememdies are out there, short of replacing the rails, light, or picking a different weapon, in order to securely mount the light on the rails?