Best Duty Holsters for the Sig P320 and M17

Fit before brand

A duty holster does one job: keep the pistol on you, through foot pursuits, car seats and struggles, then release it cleanly when you need it. For the P320 family, the hard part is that "P320" describes a whole system. Full-size, carry and compact slides, the M17 and M18, different grip modules, and a range of lights all change the shape the holster has to hold.

So the list below is organized by role, and every pick comes with the same rule: order the version listed for your exact slide length, light model and optic. This is an editorial guide built from manufacturer descriptions and retailer listings. We have not tested these holsters, and no list replaces a fit check with your own gun, unloaded.

Quick picks

Retention levels are defined by each maker, not by a single industry standard. Our retention levels guide explains how to read them.

1. Safariland 7360RDS 7TS ALS/SLS: the patrol default

Safariland describes the 7360RDS as a duty-rated Level III mid-ride holster that combines its ALS automatic lock (released with the thumb on a straight-up draw) with an SLS rotating hood. It is molded from SafariSeven, a nylon blend Safariland says is non-abrasive to a pistol's finish and structurally sound from 300°F to -50°F. The RDS version is designed for pistols with red dots.

• Best for: Uniformed officers carrying a P320 or M17 with a weapon light and an optic.
• Skip if: Your agency issues a different retention system and wants everyone on the same draw.

Retailers list 7360 versions for the P320 Full Size, so the fit exists; order the one listed for your light. Safariland adds that it cannot assure RDS fit with non-factory mounted dots, which matters if your P320 runs a plate or aftermarket slide. Browse the Safariland holsters and gear selection at Ammunition Depot for current P320 listings.

2. Safariland 6360RDS ALS/SLS: the classic Level III

The 6360 line is the holster many patrol officers picture when they hear "duty holster." Safariland lists the 6360RDS as Level III with both ALS and SLS, built from thermal-molded SafariLaminate with a suede lining, and cut for red dots, with an optional optic hood guard.

• Best for: Agencies standardized on the 6360 draw, or officers who prefer the laminate build.
• Skip if: You want the lighter SafariSeven material of the 7TS line.

Safariland's fit selector is the authority here; check that a 6360RDS exists for your P320 or M17 and light combination before ordering. For reference, a fully specified listing looks like the 6360RDS listed for a Glock 19 MOS with an X300U: one gun, one light, one optic cut.

3. Blackhawk T-Series L2D: the Level 2 value pick

The T-Series L2D ("Level 2 Duty") is one of the few duty holsters listed by name for the whole Sig family: P320, P250, M17 and M18. That is useful if you own more than one of them.

• Best for: Security officers, reserve officers and agencies that permit Level II.
• Skip if: Your policy requires Level III, or you need a confirmed light-and-optic fit.

4. Safariland 7378 7TS ALS paddle: plainclothes and range

A paddle slips on and off a belt without unthreading it, which suits detectives, administrators and instructors moving between roles. Ammunition Depot lists the 7378 for the full-size P320 with a light, the P320 compact with a light and the P320 without a light.

• Best for: Plainclothes, range staff and off-duty open carry where allowed.
• Skip if: Your agency requires belt-mounted holsters on uniform, which many do.

5. For the M18 off duty: a fitted IWB

The M18's shorter slide is the P320 family's best concealment option. A plain inside-the-waistband holster like the Galco Waistband IWB for the Sig M18 trades retention for concealment. Check that it covers the trigger guard completely, stays open for one-handed reholstering, and is legal and permitted for your off-duty carry.

• Best for: Off-duty carry of an M18.
• Skip if: You want a light or optic on the off-duty gun; this listing does not state light or optic fit.

How to match your P320

1. Identify the slide. Full-size (4.7 in, M17), carry (3.9 in, M18), or compact. Grip module length matters less to the holster than slide length, but some holsters care about frame shape.
2. Identify the light. A TLR-1 class light like the Streamlight TLR-1 HL and an X300 class light need different holsters. Light-bearing holsters are molded around the light body.
3. Identify the optic. Factory optic cut or plate, and which dot. The holster must be cut for an optic.
4. Check policy. Retention level, mount, finish and approved models.
5. Fit-check unloaded. Draw and reholster slowly with an unloaded, verified-clear gun. The retention should engage with an audible click and release cleanly.

Care and inspection

Duty holsters wear out quietly. Retention devices loosen, screws back out, and debris collects in the bottom of the shell. A short monthly routine catches most of it.

1. Unload first. Remove the magazine, lock the slide back and check the chamber before any holster inspection or draw practice.
2. Check fasteners. Look at every screw on the belt loop, hood and retention device. Use thread locker only where the maker says to.
3. Clean the shell. Turn it upside down and clear grit, lint and anything that could reach the trigger guard area.
4. Work the retention. The ALS should lock with a clear click, and the hood should rotate and spring back fully. If either feels mushy, retire or repair the holster.
5. Look for cracks. Check the shell around the trigger guard, the light pocket and the belt loop. A cracked duty holster is a replacement, not a repair.

If you change the light, optic or slide on your P320, treat it as a new gun for holster purposes and start the fit process over.

Belts and spare magazines

A Level III holster on a floppy belt is not Level III in practice. Run a stiff 2.25-inch duty belt with keepers, and set your layout so the holster does not tilt under its own weight. Our duty belt setup guide covers layout.

Load your pouches with OEM magazines such as Sig's factory P320 9mm 17-round magazine, and make sure the pouch matches the magazine length you carry.

Editorial note: This is an independent editorial overview built from manufacturer specifications, retailer listings and published sources. We have not performed hands-on testing of the products discussed, and nothing here is a performance guarantee. Verify specifications, compatibility and the law where you live.

Affiliate disclosure: Some links on this page are affiliate links to Ammunition Depot. We may earn a commission if you buy through them, at no extra cost to you. Our editorial choices are not influenced by commissions. Check current price, stock and specifications directly with the retailer.