Best Sig P320 Holster [2026] — IWB & OWB Buyer's Guide

The SIG Sauer P320 is one of the most significant semi-automatic pistols introduced in the last decade. After winning the U.S. Army's Modular Handgun System competition in 2017 — entering service as the M17 and M18 — the P320 cemented its reputation as a duty-grade, service-proven platform. But the P320's appeal to civilian concealed carriers is equally strong, driven by something no other pistol on the market does quite the same way: genuine modularity. The serialized Fire Control Unit (FCU) can be moved between grip modules, slides, and barrel lengths without going through an FFL, meaning one P320 can legitimately serve as both a full-size home defense gun and a carry-configured daily driver.

For concealed carry, the P320 Compact and P320 Carry configurations are the most popular. The Compact features a 3.9-inch barrel, 15+1 capacity in 9mm, and an overall length of 7.2 inches. The Carry variant pairs a full-size grip frame with the same 3.9-inch compact slide, delivering a 17+1 capacity while keeping the slide compact. Both configurations are excellent carry guns — the right choice depends on your body type, carry position, and whether you want a shorter grip (Compact) or maximum grip capacity (Carry).

This guide covers the best Sig P320 holster options for every carry configuration and position, explains the key features to look for in a Kydex holster for the P320, and addresses the most common questions from P320 carriers.

Sig P320 Specifications by Configuration

A critical note for holster shoppers: Sig P320 holsters are configured by slide size, not grip module size. The P320 Compact and P320 Carry both use the same 3.9-inch compact slide, so a holster molded for one will generally fit both. The P320 Full-Size uses a longer 4.7-inch slide and requires a holster molded for the full-size configuration. Always verify the slide length of your specific P320 configuration when ordering a holster.

Top Sig P320 Holster Picks from Concealment Express

1. IWB Kydex Holster for Sig P320 Compact — Everyday Concealed Carry

The Concealment Express IWB Kydex Holster for the Sig P320 Compact is thermoformed to the exact dimensions of the P320 compact slide and frame combination — accounting for the P320's 1.4-inch width, the Nitron-finished slide profile, and the trigger guard geometry that Sig Sauer refined through the MHS evaluation process. The result is a precise, consistent fit that delivers Posi-Click® retention: an audible, tactile click every time the P320 is fully seated in the holster.

The holster is made from .08-inch Kydex at the Concealment Express facility in Jacksonville, Florida. The adjustable 1.5-inch steel-reinforced belt clip positions the P320 at strong-side or appendix carry, with cant adjustable from -5° to +20°. For strong-side IWB carry with the P320 Compact, most carriers prefer a 10°–15° forward cant at the 3–4 o'clock position, which clears the grip for a natural draw without printing against the back.

The full-length sweat guard covers the P320's Nitron-finished slide, protecting both the gun's finish and the carrier's skin. The Nitron finish on the P320's slide is durable, but consistent contact with an abrasive surface — including rough nylon or poorly fitted holster material — can accelerate wear. Kydex's smooth interior and defined retention points mean the only contact is at the intentional retention surfaces, not along the full length of the slide.

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2. Tuckable IWB Holster for Sig P320 — Business and Formal Carry

The Tuckable IWB Holster for the Sig P320 Compact is built for carriers who need to maintain a fully tucked shirt while carrying the P320. The J-clip design sits over the waistband and behind the shirt hem, leaving only a small metal clip visible at the beltline. For P320 Carry carriers who carry the longer grip module, tuckable carry works best at the 3–4 o'clock strong-side position, where the grip tucks naturally behind the hip without creating forward print.

The Kydex shell on the tuckable variant is identical to the standard IWB — same Posi-Click® retention system, same full-coverage sweat guard, same adjustable cant — with a clip profile optimized for tucked-shirt carry. The P320's 5.2-inch height (Compact) or 5.5-inch height (Carry) tucks cleanly at strong-side; AIWB tuckable carry is possible but the taller grip of the Carry configuration may create more shirt distortion than the shorter Compact grip module.

3. AIWB Plus Line Holster with Claw — Appendix Carry for the P320

The Plus Line IWB Holster with Claw is the optimal setup for appendix inside-the-waistband carry with the Sig P320. The claw attaches to the holster body and presses against the inside of the waistband, leveraging belt pressure to rotate the grip inward and flatten the pistol against the lower abdomen. On a pistol with a 1.4-inch width and a 5.2–5.5-inch height, the claw makes a substantial difference in print reduction under a fitted shirt.

The P320 Compact is a natural fit for AIWB carry. The 5.2-inch height keeps the muzzle at a comfortable position in the waistband, and the Compact grip module's shorter length creates less grip print than the full Carry grip module. Many P320 Compact carriers who also want AIWB capability will run the Compact grip module with the 3.9-inch slide specifically for this reason — the Compact configuration produces the best balance of AIWB comfort and shootability.

The Plus Line holster for the P320 is also available with an optional wedge pad, which tilts the muzzle slightly away from the lower abdomen. For the P320's 7.2-inch overall length, the wedge is a meaningful comfort upgrade for seated carry — the muzzle pressure on the inner thigh is the primary discomfort in AIWB carry with any service-length pistol, and the wedge addresses it directly.

4. OWB Paddle Holster for Sig P320 — Range, Duty, and Open Carry

The Concealment Express OWB Paddle Holster for the Sig P320 is the right choice for range training, competitive shooting, open carry, or any situation where concealment is not the priority. The paddle design inserts behind the belt and waistband for a secure fit without tools — on and off quickly between stages or range sessions.

For P320 owners who carry the Compact or Carry variant for daily CCW and want to train with the same firearm, the OWB paddle holster provides a consistent draw stroke that transfers directly to the IWB carry position. The Kydex shell is formed to the same P320 mold used for the IWB lineup — same Posi-Click® retention, same trigger guard fit — so the draw mechanics built in training on the OWB holster translate accurately to the daily carry IWB setup.

Sig P320 Holster Buying Guide

Compact vs. Carry vs. Full-Size: Ordering the Right Holster

This is the most common source of confusion for P320 holster shoppers. Because the P320's grip module and slide are separate components, the holster mold is determined by the slide the pistol is wearing, not the grip module. Here is the quick reference:

• P320 Compact: 3.9-inch compact slide, compact grip module — order a P320 Compact holster
• P320 Carry: 3.9-inch compact slide, full-size grip module — order a P320 Compact holster (same slide)
• P320 Full-Size: 4.7-inch full-size slide, full-size grip module — order a P320 Full-Size holster
• P320 XCompact: 3.6-inch XCompact slide — order a P320 XCompact holster (different dimensions)

If you are unsure of your P320's configuration, measure the barrel length from the muzzle to the end of the chamber. A 3.9-inch barrel indicates the compact slide; a 4.7-inch barrel indicates the full-size slide. When in doubt, contact the holster manufacturer with your P320's exact model designation before ordering.

The P320's Width and Concealment

At 1.4 inches wide, the Sig P320 is slightly wider than a Glock 19 (1.26 inches) or a Taurus G3C (1.20 inches). That additional width is the result of the P320's modular FCU and the accommodations the frame makes for the swappable grip module system. In practical carry, the difference is modest — the P320's 1.4-inch width is well within the range of daily carry comfort with a proper holster and gun belt — but it does mean that holster fit precision matters more. A holster that fits loosely and lets the P320 shift against the body will feel the extra width more than one that holds the pistol firmly in position.

For AIWB carry specifically, the P320 Compact with the claw attachment produces a carry profile that is comfortable for most body types. The claw rotation pulls the widest part of the pistol (the grip) in toward the body, which offsets the P320's slightly wider frame compared to slimmer competitors.

Optics-Ready P320 and Holster Compatibility

Many P320 variants now ship with optics-ready slides — the XCARRY, XCOMPACT, and various X-Series models include a cut for direct mounting of common red dot footprints. If your P320 is wearing a red dot optic, you will need a holster specifically cut to accommodate the optic height. Standard Kydex P320 holsters formed without an optic cut will not accept a P320 with a mounted red dot. When ordering, confirm whether you need an optics-cut version, and specify the optic model (Trijicon RMR, Holosun 507C, Leupold DeltaPoint Pro, etc.) as each optic has a slightly different height profile.

Concealment Express offers optics-cut variants for the most common P320 carry configurations. Carry the pistol the way it is configured — do not remove the optic for carry and replace it for range use. The whole point of a red dot on a carry gun is to use it under the same conditions every day.

IWB vs. OWB for the Sig P320

For concealed carry, IWB is the dominant carry method for the P320. The Compact and Carry configurations are sized appropriately for IWB carry — the 7.2-inch overall length and 26-ounce weight are consistent with what experienced carriers run in IWB holsters every day. A quality gun belt rated for the P320's weight is the single most important supporting equipment decision for comfortable IWB carry.

Appendix Carry with the Sig P320

The Sig P320 Compact is a well-regarded AIWB carry gun, particularly popular among shooters who have trained on the Glock 19 and are looking for a Glock 19-comparable platform with a different trigger system and the added benefit of modularity. The P320 Compact's 5.2-inch height is nearly identical to the Glock 19's 5.04 inches, and the draw stroke is comparable in feel.

Key setup recommendations for AIWB with the P320 Compact:

• Claw attachment: Essential for managing the P320's 1.4-inch width at the appendix position. The claw rotates the grip inward, significantly reducing the visible grip print under a tucked or fitted shirt.
• Wedge pad: Recommended for seated carry comfort. The P320's 7.2-inch overall length means the muzzle extends to a depth where a wedge makes a noticeable difference for all-day seated carry.
• Compact grip module for AIWB: If you own a P320 Carry or Full-Size and want to convert to AIWB carry, swapping to the Compact grip module (while keeping the same compact slide and FCU) produces the best AIWB profile. The shorter grip conceals more naturally at the appendix position.
• High-quality gun belt: The P320's 26 oz weight loaded requires a rigid belt that prevents the holster from shifting or rolling during movement. A sagging or rolling AIWB holster is both uncomfortable and slower to draw from.

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Why Choose Concealment Express for Your Sig P320 Holster

Every Concealment Express holster is made by hand in Jacksonville, Florida from .08-inch Kydex. The P320 mold accounts for the specific geometry of Sig Sauer's compact slide — the Nitron finish, the trigger guard shelf, the rail profile, and the ejection port cutout. Generic striker-fired pistol molds will not deliver the Posi-Click® retention system's audible confirmation on the P320. A mold built specifically for the P320 compact configuration will.

The Posi-Click® retention system locks the P320 in place using the trigger guard shelf as the primary retention point. The click is audible and tactile — consistent from the first day of carry to years later. Retention is user-adjustable in the field with an included hex key, so carriers can fine-tune to their specific draw grip and preferred carry position.

Every order ships free. Every holster is backed by the Concealment Express lifetime guarantee — if it cracks, warps, or fails, it is replaced at no charge. For a pistol with the P320's track record and price point, a holster with the same standard of long-term reliability makes sense.

Frequently Asked Questions

Shop Sig P320 Holsters

Browse the full lineup of American-made Kydex holsters for the Sig P320 — IWB, OWB, tuckable, appendix, and optics-cut options available across multiple P320 configurations (Compact, Carry, Full-Size, XCompact). Every order ships free, and every holster is backed by the Concealment Express lifetime guarantee.

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