My friend has a colt LE/Mil 6920 and the safety will engage even if hammer is not depressed. I have noticed that the rear of the trigger is cut down on one side (factory). On most triggers that I have seen both sides of the rear portion engage the safety. could this be why it is doing this, is it a Colt thing or just the version of rifle?
This is not the one but it looks exactly like this one.
This is not the one but it looks exactly like this one.