Glock 43X vs Sig P365 – Which Micro 9mm Should You Carry?

Comparing Glock 43X vs Sig P365 is one of the most popular carry pistol matchups. Both are slim 9mm pistols built for everyday concealed carry.

In simple terms, the Sig P365 is the smaller pistol in every published dimension, while the Glock 43X has a longer grip that gives you more to hold.

If you are also choosing carry ammo, see our FMJ vs Hollow Point 9mm guide or browse more side-by-side pages in our comparison hub.

Quick Verdict

For most carry buyers:

• Sig P365 is the better choice if the smallest possible footprint matters most
• Glock 43X is the better choice if you want a fuller grip and plan to shoot it a lot

Winner for most users: Sig P365 — smaller in every published dimension than the 43X, with 10 rounds standard and optional 12- and 15-round magazines.

Glock 43X vs Sig P365 Comparison Table

Glock 43X Overview

The Glock 43X is part of GLOCK’s Slimline family. It pairs a 3.41-inch barrel with a compact-size grip, and current models add the GLOCK Slim Mounting Rail.

GLOCK describes the 43X as ideal for concealed carry, and the G43X MOS version is cut for micro red dots.

Sig P365 Overview

The Sig P365 is SIG SAUER’s micro-compact 9mm. SIG says it is striker-fired, rated for +P ammunition, and ships with XRAY3 day/night sights, a 10-round flush magazine, and a 10-round extended magazine.

SIG also offers the P365 with or without a manual safety, and in optic-ready versions.

Size and Concealability

Based on the manufacturers’ published specs, the P365 is about 0.7 inch shorter, about 0.74 inch lower, and slightly thinner than the 43X. It is also a little lighter.

That shorter grip is the P365’s biggest advantage for concealment. The 43X’s taller grip prints more easily, but many shooters can get a full hand on it.

Capacity and Magazines

Both pistols are listed with 10-round standard magazines. SIG offers optional 12- and 15-round P365 magazines, and in April 2026 GLOCK announced that G43X pistols will ship standard with new 15-round Slimline magazines starting in May 2026.

Check the listing for the exact magazines your pistol ships with. Glock and Sig magazines are not interchangeable.

Browse options like the ETS Glock 43X/48 magazine. Magazine capacity limits vary by state — always check our ammo and magazine laws guide.

Shootability

The 43X has a slightly longer barrel and a longer grip. Many shooters find that makes it a little easier to control during longer range sessions.

The P365 is still easy to shoot well for its size. Try both if you can, because grip fit matters more than small spec differences.

Pros and Cons

Who Should Choose What?

Choose the Glock 43X if you want a slim carry pistol with a fuller grip and plan to practice with it often.

Choose the Sig P365 if concealment comes first and you want the smallest pistol with 10 rounds standard.

Final Verdict

The Glock 43X and Sig P365 are both excellent slim 9mm carry pistols. The choice really comes down to grip length and overall size.

For most carry buyers, the Sig P365 is the better pick for concealment. If you want more grip to hold, the Glock 43X is a great choice.

Continue your research with our Best 9mm Ammo guide, our 115 vs 124 Grain 9mm comparison, and our comparison hub.

Frequently Asked Questions

Is the Sig P365 smaller than the Glock 43X?

Yes. Based on published specs, the P365 is shorter, lower, and slightly thinner than the 43X.

Which holds more rounds, the Glock 43X or Sig P365?

Both are listed with 10-round standard magazines. SIG offers 12- and 15-round P365 magazines, and GLOCK announced 15-round 43X magazines for 2026.

Does the Sig P365 have a manual safety?

SIG offers the P365 with or without a manual safety. The Glock 43X does not have one.

Once you have picked your pistol, see the Crucial IWB for Glock 43/43X or the 1791 Kydex IWB for Sig P365, browse our P365 holsters, or stock up in our 9mm ammo category.