Fits Glock 43X

Glock 43X Magazine: OEM 10-Round, 15-Round Slimline, and Aftermarket Options

A Glock 43X magazine is a single-stack or slim double-stack magazine designed for the Glock 43X Slimline 9x19mm pistol. The Original Equipment Manufacturer (OEM) Glock 43X magazine holds 10 rounds of 9x19mm in a single-stack polymer body. In April 2026, Glock, Inc. announced a new 15-round Slimline magazine with a metal, double-stack design at the 2026 NRA Annual Meetings and Exhibits. The 15-round Glock Slimline magazine features a magazine catch recess compatible with the standard magazine catch and is backward-compatible with existing G43X and G48 frames. TactaBlue stocks Glock 43X magazines from Glock OEM and aftermarket manufacturers in 10-round, 12-round, 15-round, 17-round, 18-round, 20-round, and extended configurations.

The Glock 43X is a Slimline 9mm pistol with a 3.41-inch (87 mm) barrel, 1.10-inch (28 mm) frame width, and a grip length that accommodates flush-fit 10-round magazines. The G43X shares frame dimensions and magazine compatibility with the Glock 48, which uses a longer 4.17-inch (106 mm) barrel slide. All G43X magazines fit the G48 and all G48 magazines fit the G43X.

Glock 43X OEM 15-Round Slimline Magazine

Official Glock Announcement

Glock, Inc. (Smyrna, GA) announced the 15-round Slimline magazine in April 2026, with availability beginning May 2026. The 15-round Glock Slimline magazine uses a metal body with a double-stack design that increases capacity from 10 to 15 rounds while maintaining compatibility with the standard G43X and G48 magazine catch. The 15-round magazine marks the first OEM double-stack option for Glock Slimline pistols.

15-Round Magazine Specifications

The Glock 15-round Slimline magazine specifications are:

• Capacity: 15 rounds of 9x19mm
• Body material: Metal with double-stack design
• Magazine catch recess: Compatible with standard Glock Slimline magazine catch
• Compatibility: G43X, G43X MOS, G43X Rail, G48, G48 MOS, G48 Rail

Aftermarket Glock 43X Magazines

15-Round All-Metal Magazine for Glock 43X

Shield Arms S15 Gen 3 magazines are 15-round all-metal magazines that fit the G43X and G48 in the factory 10-round magazine footprint. The S15 uses a stainless steel body with a double-stack design. Shield Arms recommends pairing the S15 with a Shield Arms steel magazine catch for reliable magazine retention. The S15 Gen 3 is available individually and in combo packs with the steel magazine catch at TactaBlue.

Polymer Magazines for Glock 43X/48

Aftermarket polymer magazines for the Glock 43X and G48 are available in 4 capacity options:

• 20-round polymer magazines extend below the grip and provide increased capacity for range and home defense use
• 18-round polymer magazines provide a balance between capacity and grip extension length
• 12-round polymer magazines add 2 rounds over the OEM 10-round capacity with a short base pad extension
• 10-round polymer magazines match the factory OEM capacity for state-compliant configurations

All aftermarket polymer Glock 43X magazines use an all-polymer design built for high-standard and flawless performance, maintaining reliability and durability over thousands of rounds.

High-Capacity Polymer Magazines for Glock 43X

High-capacity polymer magazines compatible with the Glock 43X are available in 33-round, 31-round, and 17-round configurations from ETS Group and ProMag. These extended magazines protrude significantly below the G43X grip and are designed for range use and home defense, not concealed carry.

Community Insights on Glock 43X 15-Round Magazines

Reddit r/Glocks discussions on the Glock 43X 15-round magazine focus on reliability comparisons between the new OEM 15-round magazine and the aftermarket Shield Arms S15. Community feedback indicates the OEM 15-round magazine eliminates the need for an aftermarket steel magazine catch, which is required for reliable function with the Shield Arms S15. Users report the OEM 15-round magazine functions with the factory polymer magazine catch.

Glock 43X Magazine Compatibility

Glock 43X magazines are compatible with the G43X, G43X MOS, G43X Rail, G48, G48 MOS, and G48 Rail. The G43X does not accept standard Glock double-stack magazines (G19, G17) because the Slimline frame uses a narrower magazine well. The Glock 43 single-stack magazine fits the G43X but holds only 6 rounds and sits shorter in the grip. A Glock magwell for the G43X funnels the magazine for faster reloads. Browse all Glock accessories at TactaBlue.