Flux
Flux Defense designs compact pistol chassis systems that convert Sig Sauer P320 and P365 handguns into personal defense weapons (PDWs) — adding a folding brace, optic mount, and improved ergonomics to create one of the smallest semi-automatic braced platforms on the market. The Raider X (for P320/M17/M18) and Raider 365 (for P365) are the core of the lineup, with the Ripcord sling system providing a purpose-built retention solution for the PDW form factor.
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Flux Raider X: The P320 PDW Chassis
The Raider X is Flux Defense’s flagship product — an aftermarket chassis that accepts a Sig P320, M17, or M18 fire control unit and slide, adding a folding stabilizing brace, integrated Picatinny top rail for optics, and a flared magazine well. The result is a PDW-format weapon that folds down to roughly the footprint of a large pistol for storage but deploys the brace in under a second for rifle-like stability at pistol distances. The Raider X is available in black, FDE, and Ranger Green. Sig Sauer has also adopted the concept into factory-complete P320-FLUX pistols that ship with Flux-designed chassis integrated from the factory.
Flux Raider 365: Micro-Compact PDW
The Raider 365 applies the same chassis concept to Sig’s P365 platform, creating an even smaller PDW. Available in standard aluminum and ultralight polymer versions, plus a standalone magwell accessory for enhanced reloads. The 365 chassis is the smallest Flux product — genuinely pocketable when the brace is folded.
Ripcord Sling System
The Ripcord is Flux’s purpose-built sling for the Raider chassis, available in QD (quick-detach) and HK-style hook configurations across multiple colors. A sling is a practical necessity on a braced PDW platform that you might carry, deploy, and stow repeatedly during a training session or range day.
Legal Status
Flux Raider chassis configurations with a stabilizing brace are classified as pistols under federal law — standard background check, no NFA registration required. The brace does not constitute a stock for legal purposes. State laws vary on braced pistols — check your state’s regulations before purchasing.
Compatibility
The Raider X accepts P320 fire control units with full-size, compact, and carry slide lengths. The Raider 365 accepts standard P365 and P365XL fire control units. Both use their respective platform’s standard magazines, including extended-capacity options.
Frequently Asked Questions
Do I need to buy a complete gun, or can I convert my existing Sig?
The Flux Raider is a chassis — you install your existing P320 or P365 fire control unit and slide into it. No FFL transfer required for the chassis alone. Sig also sells factory-complete P320-FLUX and P365-FLUX pistols that ship ready to fire.
Is the Flux Raider legal?
Yes, with a stabilizing brace it’s classified as a pistol federally. Check state laws for brace-specific restrictions.
Raider X vs. Raider 365?
The Raider X is built for the larger P320 platform with higher magazine capacity (up to 30 rounds). The Raider 365 is built for the smaller P365 platform and is more compact.
What optic mounts on the Flux Raider?
The integrated Picatinny top rail accepts any standard Pic-rail mounted red dot, or you can use the P320/P365 slide’s own optic cut with a direct-mount red dot.
Browse: Flux Raider X & Raider 365
See Also: Sig P320 • Sig P365 • AR-15 Pistols • Pistol-Caliber Carbines