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18350… if not any of my S2+ shorties, then my CatMini (probably even the same TIR lens as the Speras).
I still need to get a short tube for one of my S2+ lights, maybe the copper one 
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Current carry: S8 in shorty mode, Convoy 3v6a linear driver with SFT40 6500K, Generic “tactical ring”, KD forward clicky switch.
The deep reflector throws.
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My main every day light is a SC31 Pro on a short tube, its the perfect balance of size and weight, and amazingly good run time for what I do.
I’ve tried all the rest of my 18 diameter lights in short mode, but either grip, ballance( both in carry or use) , and run time suffers too much.
Looking at a way to put a SC18 on a short tube, but that’s a little outside the norm… 
The Armytek is a wonderful light. This company makes great stuff, the prblem is they dont make enough out it.
I rarely EDC anything smaller than an 18650 based light. Its the best power/size/runtime combination IMHO.
You should get a short tube for one of your S6.
They make great little pocket throwers!
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Yes thinking of it I have another random one I use but it doesn’t match the knurling.
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