What Glock models have size differences that affect holster compatibility?

Glock pistols vary in slide length, frame size, and accessory rails. For example, the Glock 17 (full-size) has a longer slide and grip than the Glock 19 (compact), while the Glock 43X and 48 have slimline frames. Alien Gear molds holsters to specific Glock models to ensure proper fit, secure retention, and safe trigger coverage.

How do MOS and non-MOS Glock models differ when selecting a holster?

Glock MOS (Modular Optic System) models have a milled slide for mounting red dot sights. These optics require holsters with an optic cut to prevent interference. If you're using a Glock 19 MOS, for instance, be sure the holster shell supports clearance for sights like the Trijicon RMR or Holosun 507C.

Can suppressor-height sights on a Glock affect holster fitment?

Yes. Suppressor-height sights are taller than standard factory sights and may cause friction or improper seating in holsters with low sight channels. Many Alien Gear Glock holsters accommodate these taller sights, particularly in duty holster configurations or optic-ready shells.

Are Glock 43X and 48 holsters interchangeable?

Not always. While the Glock 43X and Glock 48 share a similar slim frame, the slide length of the 48 is longer, which can affect holster fitment. Choose a holster molded specifically for the 43X or 48 to ensure proper alignment, retention, and reholstering performance.

How does barrel length impact holster design for Glock pistols?

Long-slide Glocks like the Glock 34 require holsters with an open muzzle or extended coverage. In contrast, shorter models like the Glock 26 are often paired with compact holsters for easier concealment. Barrel length affects draw angle, comfort, and holster size — especially in IWB or AIWB carry.

Is there a difference between holsters for Gen 3, Gen 4, and Gen 5 Glocks?

While external dimensions are generally consistent across generations, Gen 5 Glocks may have differences in the slide nose profile, ambidextrous slide stop, or magwell flare. Most Alien Gear holsters are compatible across generations but confirm compatibility when choosing a shell for a Glock 19 Gen 5, for example.

What holster ride height works best with Glock 17 vs. Glock 19?

For full-size models like the Glock 17, a slightly lower ride height helps balance the longer grip and slide during OWB or duty use. For compact models like the Glock 19, a higher ride IWB setup aids in concealment. Alien Gear holsters with adjustable ride height allow users to customize for comfort and draw efficiency.

Do Glock pistols with threaded barrels require special holsters?

Yes. A threaded barrel extends beyond the slide and can interfere with closed-end holsters. Choose a holster with an open muzzle design, which allows the threaded portion to protrude safely without compromising retention or reholstering. This is common with Glock 19 barrel upgrades.

What are the retention options available for Glock holsters?

Alien Gear offers holsters with passive retention via adjustable tension screws, as well as active retention for duty applications (e.g., thumb release or locking hoods). Retention systems should be chosen based on carry method, Glock model weight, and intended use (concealed carry, range use, or duty carry).

Collection: Glock Holsters | Top Rated Holsters for Glock Guns

Designed to support a wide range of Glock models — from the compact Glock 19 and subcompact Glock 43X, to the full-size Glock 17, Glock 34, and Glock 45 MOS — Alien Gear Glock holsters are molded for dependable retention and adaptable carry. Available in configurations for standard, MOS, and light-bearing setups, each holster offers adjustable passive retention with optional active retention systems for professional-grade security. Whether used for concealed carry, duty, competition, or tactical applications, these holsters are trusted by law enforcement, military, security professionals, and civilian gun owners who demand comfort, speed, and reliability.