...on GlockTalk at least.
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If you just put a flashlight like the X300 on your gun, you have the same standoff effect... plus you'd have a flashlight. And they make holsters to fit them.
A piece of equipment that is designed to be used with a sub-optimal method of solving a specific gun-fight problem (0-5') is in my opinion not the way to go. Contact shots and projecting the gun entangled will 99.5% of the time create more problems than it solves in my opinion and experience.