SIG SAUER P320 RXP – 9mm, Optics-Ready, ROMEO1PRO Red Dot
The SIG SAUER P320 RXP is a premium striker-fired, semi-automatic pistol designed to deliver enhanced speed, accuracy, and versatility through its factory-installed red dot optic system. Built on SIG SAUER’s modular P320 platform, the RXP configuration combines the proven reliability of the P320 with the SIG SAUER ROMEO1PRO reflex sight, providing rapid target acquisition and improved aiming capability. (Sig Sauer)
The P320 RXP features a durable Nitron®-finished stainless steel slide, a modular polymer grip system, and a serialized fire control unit (FCU) that allows users to customize grip size and configuration. The optics-ready slide comes equipped with the ROMEO1PRO red dot optic and backup X-RAY3 day/night sights, creating a ready-to-use package straight from the factory. (Sig Sauer)
The ROMEO1PRO optic offers a rugged aluminum housing, motion-activated illumination (MOTAC™), multiple brightness settings, and a crisp red dot for fast sight alignment in a wide range of lighting conditions. Combined with SIG’s ergonomic P320 design, the RXP provides a modern platform suitable for recreational shooting, competition, training, and other lawful applications. (Sig Sauer)
Specifications
| Feature | Specification |
|---|---|
| Manufacturer | SIG SAUER |
| Model | P320 RXP |
| Caliber | 9mm Luger |
| Action | Semi-Automatic |
| Operating System | Striker-Fired |
| Barrel Length | 3.6″ / 3.9″ / 4.7″ (configuration dependent) |
| Barrel Material | Carbon Steel |
| Slide Material | Stainless Steel |
| Slide Finish | Nitron® |
| Frame Material | Polymer |
| Fire Control Unit | Serialized Modular FCU |
| Optic | SIG SAUER ROMEO1PRO Reflex Red Dot |
| Backup Sights | X-RAY3 Day/Night Sights |
| Capacity | 15+1 or 17+1 Rounds (model dependent) |
| Trigger | Striker-Fired Factory Trigger |
| Safety | Internal Safety Systems |
| Accessory Rail | MIL-STD-1913 Picatinny Rail |
| Grip System | Interchangeable P320 Grip Modules |
| Controls | Reversible Magazine Release, Ambidextrous Slide Catch |
| Optic Cut | SIG PRO-Cut / RXP Optics Ready |
| Finish | Black Nitron® |
Key Features
- Factory-installed SIG ROMEO1PRO red dot optic
- Modular SIG P320 FCU design
- Nitron® stainless steel slide
- X-RAY3 day/night backup sights
- Striker-fired operating system
- Interchangeable grip modules
- MIL-STD-1913 accessory rail
- Optics-ready platform
- Smooth, consistent trigger system
- Available in Compact, Carry, Full-Size, and X-Series configurations (Athlon Outdoors Firearm Updates)
ROMEO1PRO Optic Features
- 1x magnification reflex sight
- 3 MOA or 6 MOA dot options
- Multiple illumination settings
- MOTAC™ motion-activated illumination
- Ruggedized aluminum housing
- IPX-7 waterproof rating
- Designed for rapid target acquisition (Sig Sauer)
Note: The exact barrel length, magazine capacity, grip module size, and included accessories vary depending on the specific P320 RXP model (Compact RXP, Carry RXP, Full RXP, XCOMPACT RXP, or XCARRY RXP). (Athlon Outdoors Firearm Updates)



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