Have you considered the single mode TANK007 TK365-1? From a quick read on reviews here on BLF, TANK007 appears to be a decent quality flashlight brand.
I looked around, but decided to modify one. Thorfire KL03 and put in a XPG2 S4 2B and a newer Convoy 4x7135 due to limited room for the battery. The Biscotti firmware has a single 100% only group if needed. On a quality 16340, it’s pushing out probably at least 600lm at 1.4A . A bit larger than my Fenix E15, but brighter and further throw.
As some have mentioned, finding a quality, single mode light can be a challenge without pulling more from the wallet. But there is one light I'm finding I like the more I use it.
The Klarus XT1C is proving to be quite the light to fit my need.
Even though it is multiple modes, on a single click it puts out 700 lumen when using the included 16340 cell.
I've found a few more that similar size, but they're older versions with less lumen output. I wonder why these manufacturers do not upgrade the LEDs, and re-release as the updated model?
no no On The Road i3
yes the i3 not the M
a cute litte zoomie, that can reach further then similar sized Olights or the M, maybe there are smaller ones, but it is also about practicality, the i3 wins hands down for its throw, small size and nice flood.
The Peaks are twisties with an optional momentary only switch. Not the best fit for a weapon light. That being said they are about the most rugged lights you’ll find.
Might have to change out tail-cap depending on what type you need. Size of old Surefire 3P.
Using same type of set up with Malkoff M31 drop-in on several rifles. But have also used Solarforce drop-in’s with no problems. Just ordered an $8 drop-in from ebay. Will give that a try on another rifle.
If your worried about dependability, you could change out head and tail-cap with SureFire ones.
Using same set up on an AK and AR for years with no problems.
Eagletac D25C is fairly narrow of high quality. It’s not single-mode though.
There’s also the Eagletac D25C2 which is a 2xCR123 version.
Since you’re looking for narrow these are worth checking out. Both lights are extremely narrow. The head is the same width as the body tube, and both are too narrow for 18350 or 18650.
Plus, the L2M has a 2-piece tube, so you can use an 18350 with the shorty tube, or 18650 with shorty tube + extension.
Roll yer own drop-in, and pot the electronix. You’ll never be able to mod it (the drop-in) once it’s pretty much one big homogeneous unit, but it’ll be as reliable as all Hell.
Use your choice of LED, your choice of 1-mode driver (you or someone said you wanted 1 mode, forgot who), and pot it up good.
I have an Olight T20 Digital XPG2 2*CR123 light that cannot fit a 18650. Too narrow. Tail cap forward clicky switch , modes are changes by twisting the head .
If you need something a bit more rugged/reliable, a Streamlight ProTac 1L might work.
It’s a 1xCR123 @ 275 lumens and can be programmed for single mode only. You can find them for under $40.
They have a newer 2-cell version (ProTac 2L-X) that gives you 500 lumens I think, and they can be had for +/- $10 more.
Same single-mode capability, and can be run on 2xCR123 or 1x18650.
Or, for a bit more (under $80) their ProTac HL-X give you 1000 lumens, but I think the head is slightly bigger than the others, so that might be a deal-breaker.