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Thread: Surefire M3LT KX9T: Modding Options?

  1. #1

    Question Surefire M3LT KX9T: Modding Options?

    apologies if this is posted in the wrong area.

    i've got a Surefire M3LT CombatLight with KX9T head.

    very awesome looking light imo. nice shape, machining, and anodization. big, BEAUTIFUL (fresnel?) optic. wow.

    i hate that it takes 123A primaries. i hate primaries unless it's an emergency-only light.
    the other issue is that the emitter tech is a decade old.

    as-is, this light is sadly not very useful to me. what modding options are there?

    my wish list:

    • ideally, i'd love to somehow get it to take 18650 (or better yet 21700) batteries.
      • can the body be bored wider? looks a little skinny, idk.
      • are there wider battery tubes? maybe something aftermarket? bonus if it doesn't cost much.
      • as a last resort, can any rechargeable (smaller) batteries be used without heavy modification to the existing battery tube?

    • i'd also love to crack the head open and get a newer emitter in there.
      • what are my options for this? i don't know much about emitters, but i can read datasheets and am comfortable with hot air rework and stuff.
      • are there any emitter modules available? maybe i'll need a new driver, too.

    any other worthwhile mods?

    i'm not totally sure, but it seems like the head can be cracked open where i have the red arrow pointing.
    i found this thread:
    but the pics are long gone. sounds like there's some glue that needs to be softened with heat. i'll try hot water, and if that doesn't work, i'll try progressively hotter temps with my heat gun.

    any guidance would be much appreciated.
    Last edited by SYZYGY; 01-11-2021 at 11:59 PM.

  2. #2
    Join Date
    Mar 2005
    Kent, England

    Default Re: Surefire M3LT KX9T: Modding Options?

    It can be bored out to 18mm be t as it is a 3 cell light it is only big enough for 1.5 18650s so you would need to find 18500 cells. It can currently fit 16500 or maybe 17500 cells. I am not sure about where that head opens but Surefire loctite is notorious, you may need a heat gun and strap wrench to get it open. Good luck!

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  3. #3
    Flashaholic* altermann's Avatar
    Join Date
    Jan 2015
    NJ / EU

    Default Re: Surefire M3LT KX9T: Modding Options?

    I did the mod of the same head
    Itís not so easy to disassemble
    Have it available for sale or trade

  4. #4

    Default Re: Surefire M3LT KX9T: Modding Options?

    Quote Originally Posted by altermann View Post
    I did the mod of the same head
    Itís not so easy to disassemble
    Have it available for sale or trade
    haha yes it appears to be solidly on there

    any tips? if you don't want to share the secrets or whatever, i respect that, it's just that i like to re-use existing parts whenever possible so as not to create waste. especially when the parts are nice.

    the heat sink fins thankfully have square sides, so i was going to chuck the head up in a vise and then heat the bezel with a temperature-controlled heat gun. i'll experiment with heating some cured loctite first to see what kind of temperature range it might soften at. although i wonder if in reality the better approach is to quickly heat the exterior with a high temperature so you don't transfer too much heat to the fresnel optic like you would by heating the whole thing slowly at a lower temperature. hard to say without experience.

    but could you at least verify that it's threaded (in the conventional sense -- clockwise tight, counterclockwise loose) and not press fit? much appreciated.

    also, can you please tell me where to look at your offerings for this light? or pm me? depending on price, i may just treat myself to the finished product. or if i ruin mine. thanks!

  5. #5

    Default Re: Surefire M3LT KX9T: Modding Options?

    edit: i found your for sale thread. nice job, altermann!
    Last edited by SYZYGY; 01-12-2021 at 04:59 AM.

  6. #6
    Join Date
    Nov 2019

    Default Re: Surefire M3LT KX9T: Modding Options?

    In terms of body, you could try M6 or bored M4 for greater capacity. That will make it another light though

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