Glock 43X vs SIG Sauer P365

Quick Comparison — Glock 43X vs SIG P365

Who Is the Glock 43X For?

The Glock 43X was Glock's answer to the micro-compact 9mm revolution that the SIG P365 started in 2018. Rather than engineering a staggered-column magazine like the P365, Glock took a different approach: they mated the slim single-stack slide of the Glock 43 to a wider grip frame that holds 10 rounds flush. The result is a gun that carries like a micro-compact but shoots like a much larger pistol. The 43X is for shooters who want Glock reliability and shootability in a slim package, and who are willing to accept a slightly larger grip in exchange for superior control and comfort during extended shooting sessions.

Strengths of the Glock 43X

• Superior Shootability: The 43X grip is 5.04" tall — long enough for a full three-finger grip. This is the single biggest advantage over the P365. You get a complete firing grip that allows faster follow-up shots and better recoil control. Shooters with larger hands will find the 43X significantly more comfortable to shoot for extended range sessions.
• S15 Magazine Upgrade: With aftermarket Shield Arms S15 magazines, the Glock 43X becomes a 15+1 micro-compact — matching the capacity of a full-size Glock 19 in a package that is 0.24" slimmer. This is a transformative upgrade that changes the gun from a 10-round single-stack into a 15-round capacity leader.
• Glock Reliability: The 43X inherits Glock's legendary reliability without any break-in period required. The single-stack magazine design is inherently more reliable than the staggered-column approach used in the P365, as there are fewer feed geometry challenges to overcome.
• Aftermarket Ecosystem: As a Glock product, the 43X benefits from the largest aftermarket in the firearms industry. Holsters are available from every major manufacturer, and upgrades from companies like Shield Arms, Night Fision, and Overwatch Precision are widely available.

Weaknesses of the Glock 43X

• Reduced Concealability: The taller grip (5.04" vs 4.3") makes the 43X harder to conceal than the P365. The grip prints more easily under a t-shirt and the overall length (6.50" vs 5.8") makes pocket carry impractical for most users.
• Factory Magazine Capacity: Out of the box, the 43X ships with 10-round magazines. The performance-defining 15-round S15 magazines cost approximately $40 each and require a separate metal magazine catch (another $10), adding to the purchase cost.
• Slide Stop Position: Some shooters find the 43X's slide stop lever difficult to reach without adjusting their grip, especially those with smaller hands. Aftermarket extended slide stops are available but add expense.

Who Is the SIG P365 For?

The SIG P365 shocked the firearms industry when it launched in 2018. By fitting 10+1 rounds of 9mm into a package smaller than most .380 ACP pocket pistols, the P365 changed what shooters expect from a concealed carry pistol. The secret is the staggered-column magazine with a curved feed path that packs 10 rounds into a grip that is only 4.3" tall and 1.06" wide. The P365 is for shooters who prioritize maximum concealability without compromising on capacity or stopping power. It is the gun you carry when you need it to disappear completely.

Strengths of the SIG P365

• Ultimate Concealability: At 5.8" long, 4.3" tall, and 1.06" wide, the P365 is genuinely pocketable. It disappears in an appendix holster, pocket holster, or ankle rig. You will forget you are carrying it — which is the single most important factor in concealed carry.
• Factory Night Sights: The P365 comes standard with SIG's XRAY3 day/night sights featuring a tritium front dot with contrasting high-visibility rear dots. This is a genuine $80–100 value that Glock does not include with the 43X standard model.
• Magazine Ecosystem: SIG offers three factory magazine options for the P365: a 10-round flush magazine, a 12-round extended magazine, and a 15-round extended magazine for the X-Macro grip. All are reliable and tested, giving you flexibility for different carry scenarios without relying on aftermarket parts.
• Modular Platform: The P365 uses the same FCU-based design as the larger P320, meaning the serialized fire control unit can be moved between different grip modules. You can start with a standard P365 and upgrade to an XL or X-Macro configuration without buying a new pistol.

Weaknesses of the SIG P365

• Snappier Recoil: The shorter barrel (3.1" vs 3.41") and smaller grip make the P365 noticeably snappier than the Glock 43X. During rapid fire strings, muzzle flip is more pronounced, and shooters with larger hands will find the gun harder to control for quick follow-up shots.
• Pinky Hang: With the flush 10-round magazine, most shooters with medium to large hands will have their pinky finger hanging off the bottom of the grip. The 12-round extended magazine solves this but adds to the overall height, partially negating the concealment advantage.
• Trigger Reset: The P365 trigger has a longer reset than the Glock 43X. While the trigger pull weight is similar, the longer reset can make rapid fire more challenging until the shooter develops muscle memory for the full travel distance.

Head-to-Head: 7 Key Categories

1. Concealability — Winner: SIG P365

The P365 is shorter, thinner, and has a smaller grip profile. It can be carried in a front pocket holster, which the 43X cannot. For deep concealment, the P365 is the clear winner.

2. Shootability — Winner: Glock 43X

The longer grip provides a complete firing grip for all hand sizes. The 43X is significantly easier to shoot accurately and quickly, especially during extended range sessions or defensive drills.

3. Capacity — Winner: Tie

Both start at 10+1 and both can reach 15+1 — the P365 with factory X-Macro magazines, the 43X with aftermarket S15 magazines. The P365 has the advantage of factory extended magazines while the 43X requires aftermarket parts.

4. Reliability — Winner: Glock 43X

The Glock's single-stack magazine is a simpler, more proven feed system. The P365's staggered-column magazine in a single-stack-width frame is clever but inherently more complex. Both are reliable with proper maintenance, but the 43X has fewer potential failure modes.

5. Factory Features — Winner: SIG P365

The P365 ships with tritium night sights, a full FCU-based modular system, and multiple factory magazine options. The 43X ships with basic white-dot sights and standard Glock texture. You will spend money upgrading the 43X to match the P365's factory feature set.

6. Sights — Winner: SIG P365

XRAY3 tritium night sights are vastly superior to the standard Glock white dot sights. The P365's sights are usable in any lighting condition out of the box.

7. Aftermarket — Winner: Glock 43X

Glock's aftermarket ecosystem is 10x larger than SIG's. Holsters, sights, triggers, and magazines for the 43X are more widely available and generally more affordable.

MatchMyGun Verdict

If you prioritize deep concealment and factory features out of the box → buy the SIG P365.

If you prioritize shootability, reliability, and aftermarket support → buy the Glock 43X with S15 magazines.

The SIG P365 is the ultimate deep-concealment pistol — it hides better, comes with tritium night sights, and offers a wider range of factory-configurable options through the FCU system. The Glock 43X is the better-shooting gun — easier to control, more comfortable for extended range sessions, and backed by Glock's unmatched aftermarket. For pocket carry and maximum concealment, choose the P365. For IWB carry where shootability matters, choose the 43X.