I have maybe eight Surefire bodies, a few 6p and five G2 Nitrolons, all of them used as Malkoff hosts. So far all of 'em are running on Panasonic CR123a batteries and I doubt this will change. But I have considered having one host bored for an 18650 just for kicks.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman