#4 has self defeating fins on either side of the core. Heat really wouldn't have a way of reaching them.
#3 looks nice, but that finning on the sides of the middle fins.. not necessary. The thermal barrier will radiate beyond them. They are more for looks. And frankly, looks don't count for much on a homeade block under a copper top.
is that an HK USP compact? I can't tell due to the dark pic. Nice weapon.
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