Base IWB Concealed Carry Holster for Sig P320 Compact 3.9in - Veteran

In this review of the Base IWB Concealed Carry Holster the bottom line is simple: this is a no-frills, well-built inside-the-waistband holster tailored for the Sig Sauer P320 Compact/Carry and M18 with a 3.9in barrel. Its single biggest reason to buy is reliable, adjustable retention delivered in a sweat-guarded design made in the USA, which makes it a good choice for daily concealed carry when a close, secure fit and a smooth draw are priorities.

Key Features

• Model Fit: Precision CAD-milled molds ensure a tight, secure fit specifically for Sig Sauer P320 Compact, P320 Carry and M18 with a 3.9in barrel, so the pistol seats consistently.
• Concealed Carry Design: Inside the waistband construction keeps the pistol close to the body for unobtrusive carry and better concealment under everyday clothing.
• Adjustable Retention and Cant: Retention pressure and carry angle are adjustable from 0-15 degrees, allowing users to tune draw tension and ride position to their preference.
• Durable Materials: Molded from 0.08in Boltaron material with stainless steel black powder coat hardware, the holster resists wear and maintains shape over time.
• Sweat Protection: A full-length sweat guard covers the slide to protect firearm finish and reduce moisture contact during prolonged carry.
• Retention Lock: The Posi-Click audible retention system gives positive feedback when the pistol is seated for secure carry and quick confirmation.

Who It's For

The Base IWB holster is aimed at owners of the Sig Sauer P320 Compact, P320 Carry and M18 with the 3.9in barrel who want a sturdy, American-made IWB option with customizable retention and cant. It fits users who prioritize a smooth draw, a full-length sweat guard, and a holster that reduces holster wear against slide controls.

Those who use red dot optics, rail-mounted lights or laser attachments should look elsewhere, since this model is not optic compatible and will not accept light/laser Picatinny accessories. If you require a cross-draw, OWB, or duty-style platform, this inside-the-waistband holster is not the intended fit.

Pros & Cons

Pros

• Solid build quality and materials give a durable, long-lasting holster that stands up to daily carry.
• Adjustable retention and cant let users personalize draw feel and carry position for comfort and speed.
• Sweat guard and recessed molding reduce contact with slide controls and help protect firearm finish.

Cons

• Not compatible with red dot optics or light/laser attachments, limiting use with many accessory setups.
• Belt clip width of 1.5in may not match all belt styles for those needing wider duty belts.

Specifications

Compatibility	Sig Sauer P320 Compact / P320 Carry / M18 3.9in barrel (no optic)
Holster Type	Inside the Waistband (IWB)
Material	0.08in Boltaron
Retention System	Posi-Click audible retention lock with adjustable tension
Belt Clip Width	1.5in
Hardware	Stainless steel with black powder coat
Made In	USA with lifetime warranty and 100% satisfaction return policy

Our Verdict

The Base IWB holster is a practical, well-made choice for P320 Compact/Carry and M18 owners who carry without optics or weapon lights. Its adjustable retention, sweat guard and precision molding deliver a secure, comfortable everyday carry experience, and the American-made construction with a lifetime warranty makes it a solid value for those who prioritize function over accessory compatibility.

Frequently Asked Questions

Will this holster fit a P320 with a red dot?
No. This model is not optic compatible and will not accept red dot sights.

Can I use a weapon light or laser with this holster?
No. The holster will not fit pistols with light or laser Picatinny attachments.

Is retention adjustable?
Yes. Retention pressure and carry angle can be adjusted to tune draw tension and ride position.