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I have used one on a g21 at the range and had no issues. You do have to wipe the soot now and a again but for home defense I doubt you'll go through several 50rd boxes to even have to to that! Hope that helps.
I use a SF X300 on a G22/23 and had previously used the TLR-1, my co-worker uses a TLR-1 on his G21, no issues to speak of. Another co-worker uses the new Insight light on a G22. I have personally seen 2 Glock lights pop of the rails of a G22, the lights were sent back and new ones were sent back. I have not heard of any new problems.
All of the other lights mentioned are to be considered much better in my book than the glock light.
On the other hand, I personally think that the glock light looks pretty smooth on a glock pistol! It is a match made in heaven and I don't even like glocks!
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