What is a holster shell, and how does it work?

A holster shell is the molded outer portion of a holster that locks around the specific firearm. In the Alien Gear modular holster system, each shell is firearm-specific, offering precision retention and allowing you to swap shells across compatible IWB and OWB platforms—eliminating the need to buy a whole new holster for every gun.

How do I choose the right holster shell for my firearm?

Select your holster shell based on your exact firearm make, model, and generation. Alien Gear offers an extensive fit library to ensure perfect shell-to-pistol compatibility, including options for popular models like Glock, Sig Sauer, Springfield, Smith & Wesson, and more.

Can I use a holster shell with both IWB and OWB configurations?

Yes. Each Alien Gear shell is compatible with multiple carry platforms, including inside-the-waistband (IWB), outside-the-waistband (OWB), appendix, and even shoulder or chest rigs, making it part of the best modular holster system for adaptable EDC.

How does a holster shell affect firearm retention and security?

The shell defines your retention level. Alien Gear shells feature adjustable passive retention, giving you full control over draw resistance while maintaining trigger guard protection and secure lockup during movement.

Are holster shells safe for carrying a loaded firearm?

Yes. Each Alien Gear holster shell fully encloses the trigger guard, supports firm retention, and is built with high-strength polymer to safely carry loaded firearms during everyday use, duty, or tactical applications.

Do holster shells work with tactical belts, duty belts, or battle belts?

Absolutely. When paired with the correct Alien Gear holster base, shells work seamlessly with tactical setups, including MOLLE gear, drop leg platforms, and duty belt loops, giving you modularity without compromising stability.

Can I use one holster for multiple guns?

Yes. That’s the power of the Alien Gear holster shell swap system. Just switch the shell while keeping the same base, allowing you to carry multiple firearms using a single holster system—ideal for range, rotation, or duty weapon changes.

How do I convert my holster for a different pistol?

To convert, simply unscrew your current shell and attach the new model-specific shell to your holster base. The shell swap process is tool-free or requires minimal adjustment, making it fast and user-friendly.

What’s the most cost-effective way to carry different guns?

Invest in a modular holster system like Alien Gear’s and add only the holster shells you need for each firearm. This lets you build a multi-gun carry setup without buying full holsters for each pistol.

How do I switch my holster to fit a new handgun?

Use Alien Gear’s Shell Swap Program or order a new shell compatible with your platform. You’ll have a fully functional holster for your new handgun—no need to purchase an entirely new rig.

Collection: Holster Shells | Shop Cloak Shells for Multiple Gun Models

The Holster Shells from Alien Gear Holsters are the core of a truly modular holster system, built for those who carry more than one firearm. Each Alien Gear shell is precision-molded to your specific gun model and designed to swap seamlessly across compatible platforms—giving you the flexibility to run one holster for multiple guns. Whether you're updating your EDC setup, switching duty weapons, or expanding your collection, this shell swap system lets you adapt without compromising comfort, retention, or performance. It's the foundation of the best modular holster system for concealed carry, range, or tactical use.