I had a lightweight upper built at RRA, with a light mid-length barrel. The one thing I can say is the forearm gets HOT after about 2 or 3 mags... hot enough that I now wear a tacticool glove (an old motocross glove I cut the fingers off of...) to hold the silly thing. This with a standard forearm setup, Magpul covers.
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"I have this pistol pointed at your heart!"
"That is my least vulnerable spot."
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