So…it definitely looks like a head. One set of threads screws battery tube, the other - the pill. There is probably the third one for the bezel. But there were ‘head’ guesses before…
Added: though I don’t understand why the pill needs different threading, so the above is probably wrong….
Maybe a quad led head for s2+ ? 
I will say a complete head for a triple setup .
Possibly a heatsink before fins are added, but it looks like the beginning of a crenelated bezel for the S2+, useful for self defense.
It’s the shortest most edc’able DIY (18350/16340) quad with crenelated bezel in the world! 
And the world went wild!!! :partying_face:
Well the BLF world went wild! 
For crying out loud, just hurry up so I can order one of these, will you! :smiling_imp:
:+1:
oh man,cant wait!ill be sure to order one.
I’m going to go with electromagnet. I’ve really wanted a pocket electromagnet.
Perhaps its a heating device to make something hot or to discharge the battery.
The other Idea I have, It could be a pocket Laterna with down-light in tailstand.
BUMP
Hey kiriba-ru, thanks for getting me that HD2010 spacer, and for shipping it out so quick, the machining is excellent! It’s great that you make these special parts for us! Also much thanks for the free gift! (spare 2010 reflector) It will be a big help for my project. Sorry I didn’t reply sooner been off the forum for a while, you’re awesome!
Are there any C8 triple setups still available?
I dont know why I need to say it each month, but once again:
Yes, first post is updated as soon as some item is sold and most time actual quantities are listed.
Upd.
When I dont leave exact quantity but write “in stock” this usually means more than 10pcs stocked.
I apologize for the repeat inquiries of your products I just seen the price but no quantity I probably should have asked what the quantity was available for the C8 not if they were available, my bad.
No problem.
When somebody will meet this thread first time and see such questions he could think that there is no actual stocks.
Ok no problem.
I will say that the new quad M2 setups look amazing in the light with the new glow o-ring it’s definitely adds a great look and appeal to the light! I would add some photos if I knew how to lol.
I have made several test fits and found out than Ф20.1mm circle can perfect fit inside stock positive contact ring.
Any ideas about proper height? 2.0mm to make it 0.5mm taller than stock contact ring?
+1 for the UF-1406 and/or 1405 pills if that’s still on the table. Can’t seem to find anything better than the light-weight aluminum crap it comes with reverse threaded in. Thanks!
Sorry, moq for threaded parts is 50pcs.
What is moq?
Minimum Order Quantity