Glock 43X MOS — 9mm, 15-Round, Optics Ready

Glock G43X MOS Sub-Compact 9mm 3.4in GMB Barrel 15+1 Front Rail - Made in USA

Get concealed carry capacity that doesn't force a compromise with the Glock 43X MOS — a 9mm subcompact pistol built on Glock's slimline frame that pairs all-day comfort with a 15-round magazine and factory-ready optics mounting.

The 3.41" Glock Marksman Barrel wears an nDLC finish, an advanced surface treatment that delivers exceptional corrosion resistance along with a low-glare matte surface — a real advantage for daily carry where reflection can compromise concealment or comfort against holsters. The Modular Optic System (MOS) slide is precision-machined for direct red dot mounting, so you can add a micro red dot without gunsmithing or a separate adapter plate, giving you faster target acquisition than fixed iron sights alone.

Despite its slimline, easy-to-conceal profile, the 43X MOS holds 15 rounds standard, giving you significantly more capacity than most subcompacts in this size class without stepping up to a bulkier duty-size frame. The polymer frame includes an integrated accessory rail for a weapon light, along with a beavertail for a higher, more consistent grip and better recoil control. Fixed sights come standard, so the pistol is fully functional right out of the box whether or not you add an optic later.

Whether you're upgrading from a lower-capacity subcompact, want an optics-ready platform for your first red dot pistol, or need dependable Glock reliability for daily concealed carry, the 43X MOS delivers real capacity in a genuinely concealable package.

Model G43X
Caliber 9mm Luger
Barrel Length Range 3" to 3.99"
Gun Platform Glock Component Compatible
Capacity 15+1
Action DAO
Frame Finish Black
OAL 6.50"
Frame Material Polymer
Hand Ambidextrous
Slide Finish Black
Slide Material Steel
Sights Fixed
Slide Description Optic Ready / Serrated
Barrel Finish Black
Barrel Material Steel
Trigger Pull Weight 5.50 lbs
Height 5.04"
Width 1.10"
Barrel Description GMB
Barrel Length 3.41"
Max Capacity 15
Weight 1.06 lbs
Frame Description Polymer Frame w / Accessory Rail

Frequently Asked Questions

Q: What caliber is the Glock 43X MOS chambered in?
A: It's chambered in 9mm Luger.

Q: What is the magazine capacity?
A: It ships with 15-round magazines standard.

Q: What does "MOS" mean, and how does it work?
A: MOS stands for Modular Optic System. The slide is precision-machined to mount a variety of micro red dot optics directly, without needing separate adapter plates or gunsmithing.

Q: What is the barrel length and finish?
A: The barrel is 3.41" with an nDLC finish, which provides high hardness, strong corrosion resistance, and a low-glare matte surface.

Q: Does this pistol have iron sights if I don't mount an optic?
A: Yes, it comes with fixed sights standard, so it's fully functional for carry or use straight out of the box with or without an optic installed.

Q: Does the frame have an accessory rail?
A: Yes, the polymer frame includes an integrated accessory rail for mounting a compatible weapon light.

Q: Where is this pistol made?
A: This model (PX4350203FRMOS) is manufactured in the USA at Glock, Inc. Glock also produces pistols at its original facility in Austria; both are built to the same quality standards.