SIG Sauer P320 9mm in FLUX Defense Raider Chassis, 4.5 in Threaded Barrel, Telescoping Brace, Left-Side Charger, RMR-to-ACRO Adapter, 21+1
This customized SIG Sauer P320 9mm is configured in a FLUX Defense Raider polymer chassis with a telescoping pistol brace and left-side charging handle. It features a 4.5-inch threaded barrel with a knurled muzzle device, a forward spare-magazine well (Speed-Load System), and a top-mounted RMR-to-ACRO adapter. The serialized P320 FCU is visible through the Raider chassis window, and the optic rail has been shortened for a smaller overall profile. Two SIG factory magazines (21-round and 17-round) are included.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Minor scratches and blemishes are present. The optic rail has been cut down to reduce the overall profile.
What’s Included
- FLUX Defense Raider chassis with telescoping pistol brace (installed)
- RMR-to-ACRO adapter plate (installed)
- Knurled cylindrical muzzle device (installed)
- Sling
- 1x 21-round SIG Sauer factory 9mm magazine
- 1x 17-round SIG Sauer factory 9mm magazine (one magazine body marked "MADE IN ITALY")
The FLUX Defense Raider chassis adds mission-driven ergonomics to the P320 platform, including a left-side external charging handle and the Raider Speed-Load System with a forward spare-magazine well. The telescoping pistol brace uses dual guide rods for a compact, controllable setup. No forearm/Velcro strap is present on the brace. The serialized P320 FCU remains visible through the chassis window.
The 4.5-inch barrel is threaded 1/2x28 and fitted with a knurled cylindrical muzzle device. This configuration ships with two SIG Sauer factory steel magazines (21-round and 17-round), supporting a 21+1 capacity. One magazine body is marked "MADE IN ITALY."
Topside, an RMR-to-ACRO adapter is installed on the Raider chassis. The optic rail has been cut down for a smaller overall profile. Iron sights are present, with a front post featuring a green insert for clear indexing.
The chassis includes an underside 1913/Picatinny accessory rail for lights or other compatible accessories. This striker-fired 9mm build retains the P320’s polymer construction within the Raider’s polymer chassis for a durable, lightweight package focused on speed and handling.