Dark Matter Props 21-Round Magazine Sleeve for P365X & P365XL (Coyote)

Enhance your P365X and P365XL with a purpose-built 21-round sleeve

Dark Matter Props introduces a custom-designed sleeve that addresses the visual and functional gap when pairing a 21-round magazine with the compact P365X or P365XL grip modules. This sleeve is crafted to work with the XMacro baseplate from Sig’s 17-round magazines, delivering a cohesive look and confident alignment at the cursor of your firearm’s profile. While it’s designed for performance, it also offers a crisp, professional appearance that can enhance your overall setup.

The sleeve is a dedicated accessory rather than a full magazine kit, and you’ll see the most dramatic impact on the line where the magazine meets the grip. By smoothing the transition, the sleeve reduces the visual disparity between parts and helps prevent over-insertion scenarios. It’s a practical upgrade for users who value both aesthetics and consistency in their magazine-to-grip presentation.

Key benefits at a glance

• COMPATIBILITY: Custom-designed sleeve for P365 21-round magazines to minimize gaps and prevent over-insertion with P365X/XL grip modules
• DESIGN FEATURE: Integrates with the XMacro baseplate from 17-round magazines for a seamless fit
• AESTHETIC ENHANCEMENT: Creates a clean, professional look by eliminating visible gaps between magazine and grip
• MATERIAL: Durable plastic sleeve designed for long-term use and reliable performance
• VERSATILITY: Specifically designed for P365X and P365XL models

Construction, fit, and customization

Fabricated as an SLA resin print using Siraya Tech Blu Nylon Black professional UV resin, the sleeve receives careful finishing: light sanding followed by a matte black paint to reduce glare and enhance durability. The combination of rigid plastics and a meticulous finishing process yields a sleeve that holds its shape while maintaining a slim profile.

• Material and finish: SLA resin printed, matte black, designed for a subtle, tactical look
• Durability: Built to endure routine handling and magazine cycling without compromising appearance

Fit tips and user considerations

Temperature can influence how snugly the sleeve fits. At room or body temperature, the sleeve tends to sit snugly; colder magazines may feel looser. If it’s too tight, cooling the magazine in the refrigerator and trying again often helps. If the sleeve sits too loose, a few pieces of tape at the bottom can provide a tighter, adjustable fit. For questions or tweaking, feel free to reach out.

Usage notes

This listing is for the plastic sleeve only. Magazines, baseplates, and grip modules shown are for reference to illustrate the completed assembly. The sleeve is designed to be compatible with NDZ Performance baseplates and may work with other brands, though untested compatibility cannot be guaranteed. Some users may choose to modify the baseplate supplied with their 21-round magazine (e.g., trimming the top) to achieve the best fit between the sleeve, baseplate, and grip.

In practice, this sleeve offers a practical way to unify the look of your magazine setup while preserving function. It’s a targeted upgrade for enthusiasts who want a cleaner, more cohesive presentation without altering the core magazine or grip geometry.