Description
The P320-FLUX LEGION is a drop-in chassis system that turns your SIG P320 into a compact PDW without permanent modification. Designed for shooters who want a stable, shoulder-fired platform from a handgun they already own. We’ve carried this since summer 2025, and it’s become a regular reorder item—consistently popular with our customers. It’s built for range fun, home defense, or just getting better hits at distance.
Key Highlights
- Drop-in fit on every frame we tested—no fitting required, no permanent changes to your pistol.
- Integrates a folding brace and full-length top rail for optics, lights, and lasers.
- Ambidextrous controls—works for both left and right-handed shooters out of the box.
- Lightweight at 5.3 oz—adds negligible weight to your setup, keeps it packable.
- Compatible with P320 full-size, carry, and compact slides—check your model before ordering.
| Material | Reinforced polymer with steel inserts |
| Weight (measured) | 5.3 oz |
| Length (folded) | 9.2 in |
| Length (deployed) | 17.5 in |
| Rail | Full-length Picatinny, 10 slots |
| Brace type | Adjustable folding brace (brace not included) |
| Compatibility | P320 full-size, carry, compact (tested with factory and aftermarket frames) |
| Country of origin | USA |
Will this work with my P320 M17 or M18?
Yes, we’ve tested it on both M17 and M18 variants—drop-in fit with no issues. Works with standard and manual safety models.
Does the P320-FLUX LEGION require any permanent modification?
No permanent mods are needed. It replaces the grip module and uses the existing trigger group and slide. You can swap back to a standard grip in minutes.
What brace does this accept?
The chassis uses a standard AR-style buffer tube mount. Most pistol braces with a 1.15-inch inner diameter tube will work. We recommend a SB Tactical or Gear Head Works brace.
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