Hello Jax, I have not noticed it in the slightest.
While this is my first carbine using this light set-up I’ve seen plenty of world-class & other great shooters using this light set-up; Larry Vickers, Kyle Defoor, Jason Falla, Ashley B. from Blue Force Gear, David Pennington, GotM4, SAM, The_Katar, etc. I’ve never heard any of them mention heat being an issue.
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