Description
The Arisaka Defense 300 Series Light Body is a slimmed down replacement shell for SureFire Scout Light M300 weapon lights. It strips away the integrated Picatinny clamp found on the stock body, which opens up a surprising amount of front sight clearance when you run it with an Arisaka Inline Scout Mount on handguards that have 45 degree surfaces next to the top rail. The result is a light that tucks in close and low, out of the way of your sights and your support hand.
What Makes the 300 Series Body Different
Even with the clamp gone, this body keeps the mounting holes and square lug interface on the underside, so it drops right into just about any aftermarket Scout mount you already own. It accepts standard Scout Light M300 series tailcaps and heads like the KM1E, KE1A, and KX1A, and IR heads are fully supported for anyone running night vision. That flexibility is the whole point here. You're not locked into one ecosystem, so you can mix SureFire, Malkoff, or Modlite parts to build the setup you actually want.
Build Quality You Can Feel
The body is CNC machined from 6061-T651 aluminum and finished with a MIL-A-8625 Type III hard coat anodizing in black. Threads and the interior get a chem film conversion coating for solid electrical conductivity and corrosion protection, and quality Buna-N O-rings come in the box. At right around half an ounce, it's one of the lightest Scout pattern bodies out there, which folks who've run it notice right away in the handling.
Pairing It Up
Since this is the body only, you'll add a head and tailcap to finish the build. A popular match is the Malkoff E1HTv2, which pushes a clean beam with a good mix of throw and spill in a compact package. Grab a Scout pattern tailcap and a mount, and you've got a tidy, purpose built light.
Key Specifications
- Manufacturer: Arisaka Defense
- Manufacturer Part Number: LB-300
- UPC: 642049503915
- Model: 300 Series
- Color/Finish: Black, Type III Hard Coat Anodized
- Material: 6061-T651 Aluminum, CNC Machined
- Compatibility: SureFire Scout Light M300 bezels and tailcaps
- Head Compatibility: KM1E, KE1A, KX1A, and IR heads
- Weight: Approximately 0.5 oz
- Interior Treatment: MIL-DTL-5541 Type II Class 3 chem film
- Product Type: Weapon Light Body / Replacement Part
- Origin: Made in the USA
What’s Included
- Arisaka 300 Series Light Body (black)
- One #17 O-ring
- One #15 O-ring
Frequently Asked Questions
Does the Arisaka 300 Series Light Body come with a head or tailcap?
No, this is the light body only. You'll need to add a compatible head and a Scout pattern tailcap to build a complete light. High quality Buna-N O-rings are included so the body is sealed and ready once you finish the assembly.
What heads work with the 300 Series body?
It accepts standard SureFire Scout Light M300 series heads like the KM1E, KE1A, and KX1A, plus IR heads for night vision use. It's also a favorite base for Malkoff heads such as the E1HTv2. Since it uses the common Scout pattern, you have a lot of freedom to mix and match brands.
Why remove the Picatinny clamp from the body?
Ditching the stock clamp lets the light sit much closer to the handguard, which frees up clearance for front sights when paired with an Arisaka Inline Scout Mount on 45 degree surfaces. It also trims weight and gives you a cleaner, lower profile setup. The underside still keeps the mounting holes and square lug, so it fits most aftermarket Scout mounts.
Will this body fit in mounts I already own?
In most cases, yes. It retains the mounting holes and square lug interface on the underside, so it drops into just about any aftermarket Scout mount built for the M300 pattern. Arisaka's own Inline, Offset, and Side mounts are designed to take full advantage of the low profile shape.






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