Sig Sauer SI320X510BXR3M1 P320 XTEN 10mm (5″) — Optic Ready Slide, PRO RX footprint (Pkg qty 4)
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Sig Sauer SI320X510BXR3M1 P320 XTEN 10mm (5″) polymer centerfire pistol with an optics-ready slide using the PRO RX footprint and an X Straight Trigger; sold in packages of 4 (SKU SI320X510BXR3M1).
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Description
Description
Product Overview
Sig Sauer SI320X510BXR3M1 is cataloged under Firearm > Pistols > Polymer Centerfire Pistols. Source facts identify this as a P320 XTEN 10mm with a 5″ configuration featuring an optic-ready slide and a PRO RX optic footprint, plus an X Straight Trigger. The listing is offered in a package quantity of 4 and is shown as in stock (SKU SI320X510BXR3M1).
Why This Product
For buyers who will mount red-dot optics, the verified optic-ready slide and PRO RX footprint are primary selection criteria because they define the physical mounting interface. The listed X Straight Trigger provides a clear trigger-style identifier for inventory differentiation.
Key Verified Specifications
- Brand: Sig Sauer (source_fact_ids: product-276392:f002, product-276392:f006)
- Category: Firearm › Pistols › Polymer Centerfire Pistols (source_fact_ids: product-276392:f003, product-276392:f004, product-276392:f005)
- Package quantity: 4 (source_fact_ids: product-276392:f008, product-276392:f012)
- Slide: Optic Ready Slide (source_fact_ids: product-276392:f009)
- Optic footprint: PRO RX footprint (source_fact_ids: product-276392:f010)
- Trigger: X Straight Trigger (source_fact_ids: product-276392:f011)
- SKU: SI320X510BXR3M1 (source_fact_ids: product-276392:f014)
- Availability: instock (source_fact_ids: product-276392:f015)
Appropriate Use Cases
- Procurement of optics-ready P320 XTEN pistols where mounting a red-dot using the PRO RX footprint is planned (source_fact_ids: product-276392:f009, product-276392:f010).
- Inventory segmentation by trigger style where the X Straight Trigger is required for product differentiation (source_fact_ids: product-276392:f011).
What Customers Should Know
- Package quantity is 4; confirm whether the listing contains complete pistols with magazines and accessories or a different configuration—source facts do not enumerate full kit contents (source_fact_ids: product-276392:f008).
- The product name implies caliber (10mm) and barrel length (5″) but source facts do not provide full technical confirmation beyond the attributes listed—verify exact caliber, barrel length, and included accessories with the vendor before ordering.
Specifications
- Short Stroke Gas Piston Gas System (Rifle Length)
- 18.6″ Barrel Length ( Mid-Weight style, non-fluted)
- 1:8 Twist Rate Rifling

