Originally Posted by
750.356
The flickering is likely being caused by the batteries briefly losing contact and 'bouncing' against the head of the light as the carrier assembly slams forward. This is the nature of Surefire E-series LED heads, which don't have spring contact on the positive side of the batteries.
My E2DL had the same issue, except that it would spontaneously switch to low mode with every jerk (the head of the E2DL is a 2-mode version of the KX2C head on your M600C). Many times, it wouldn't take much force at all; simply placing the light on its tailcap on my desk would often make it switch to 'low' mode if it was on 'high'.
The only thing that could help the problem would be a stronger/ longer tailcap spring, which could help keep the batteries in contact with the LED head.
It's probably a moot point anyway, as I'm not sure why one would want a carbine's light clicked 'on' while doing weapon manipulations.
Either way, it's not a problem with the LED assembly itself, and nothing to worry about.
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