What is the Shield Arms Custom Glock 48 MOS?
The Shield Arms Custom Glock 48 MOS is a professionally customized pistol built around our proven S15 15-round magazine system, offering 50% more capacity than factory Glock 48 magazines. Each pistol is custom-built by our team with upgraded components, enhanced features, and available custom Cerakote finishes—transforming the compact Glock 48 MOS into a superior concealed carry platform.
Available in three package levels:
- Enhanced Package - Core upgrades with S15 magazine system
- Pro-Carry Package - Adds upgraded night sights and carry magwell
- Elite-Carry Package - Complete package with threaded barrel and performance trigger
Purpose-Built Custom Performance
The Shield Arms Custom Glock 48 MOS represents the pinnacle of compact 9mm carry pistol design. Built on the foundation of Glock's reliable MOS (Modular Optic System) platform, each pistol is meticulously customized by our team to deliver enhanced capability far beyond factory specifications. At the heart of every custom build is our revolutionary S15 magazine system, which increases capacity from 10 rounds to 15 rounds without adding bulk—a game-changing advantage for concealed carry.
Every Custom Glock 48 MOS undergoes professional modification and enhancement in our facility, where we integrate premium components and apply custom Cerakote finishes. Whether you choose the Enhanced Package for core performance upgrades, the Pro-Carry Package with upgraded sights and magwell, or the Elite-Carry Package with threaded barrel and McNally trigger, you're getting a custom-built pistol optimized for real-world carry and performance. Each build includes our Black Nitride Standard Steel Magazine Catch, essential for reliable operation with the S15 magazine system.
These custom pistols maintain all the advantages of the Glock 48 MOS platform—compact dimensions for easy concealment, MOS optics-ready slide cuts, and Glock's legendary reliability—while adding significant capability through carefully selected upgrades. Made in the USA and backed by our 100% lifetime warranty, the Shield Arms Custom Glock 48 MOS delivers unmatched value for discerning shooters who demand more from their concealed carry pistol.
Custom Package Options Explained
Enhanced Package - Core Performance Upgrades
The Enhanced Package delivers the essential upgrades that transform the Glock 48 MOS into a higher-capacity carry pistol. You receive the Glock 48 MOS chambered in 9x19mm, two S15 15-round magazines, and our Black Nitride Standard Steel Magazine Catch—the critical component for reliable S15 magazine function. This package is ideal for shooters who want increased capacity and proven reliability without additional modifications.
Pro-Carry Package - Enhanced Sights and Handling
Building on the Enhanced Package, the Pro-Carry Package adds upgraded Ameriglo I-Dot Night Sights for superior low-light visibility and faster target acquisition. The included Shield Arms Carry Magwell ensures faster, more reliable reloads while maintaining the pistol's slim profile for concealment. This configuration is perfect for serious concealed carriers who prioritize rapid reloads and all-lighting-condition capability.
Elite-Carry Package - Complete Custom Build
The Elite-Carry Package represents our most comprehensive custom build. In addition to all Pro-Carry features, you receive a Black Nitride Threaded Barrel for suppressor compatibility and a McNally Trigger for improved trigger feel and performance. This package delivers a fully customized pistol ready for any defensive or tactical application, from everyday carry to home defense with a suppressor. Every component is selected for maximum performance and reliability.
Key Features
- S15 Magazine System - 15-round capacity in a slim, single-stack profile—50% more ammunition than factory magazines
- MOS Optics-Ready Platform - Precision-milled slide cuts accept micro red dot optics for faster target acquisition
- Custom Cerakote Finishes - Choose from Black, Fallout, Montana Mud, or Pineland patterns, all applied in-house for unique appearance and enhanced durability
- Upgraded Components - Package-dependent enhancements including night sights, carry magwell, threaded barrel, and performance trigger
- Black Nitride Steel Magazine Catch - Essential upgrade for reliable S15 magazine operation, included in all packages
- Glock Marksman Barrel - Match-grade GMB barrel with enhanced rifling delivers improved accuracy
- Slimline Design - Compact grip width and short trigger distance optimized for concealed carry comfort
- Professional Custom Build - Every pistol customized and assembled by Shield Arms team to exacting standards
Custom Cerakote Finish Options
Each Custom Glock 48 MOS is available with professional Cerakote application performed in-house by our team. All pistols come standard with Glock's factory nDLC finish, with optional custom Cerakote upgrades available. Our Cerakote process provides superior durability, corrosion resistance, and unique aesthetic appeal. Because each pistol is hand-finished, no two Cerakote builds are exactly alike—your custom Glock 48 MOS is truly one of a kind.
Available Cerakote finishes:
- Black - Classic matte black finish for timeless appearance
- Fallout - Tactical urban camouflage pattern
- Montana Mud - Earth-tone tactical finish
- Pineland - Woodland camouflage pattern
About the Glock 48 MOS Platform
The Glock 48 MOS serves as the foundation for our custom builds, offering an ideal balance of concealability and capability. Chambered in 9x19mm Luger, the G48 MOS features a compact-length barrel with full-size grip length, providing excellent shooting characteristics in a package suitable for concealed carry. The MOS designation indicates the slide is precision-milled to accept popular micro optics, allowing you to mount red dot sights for enhanced accuracy and speed.
Glock's Slimline series design incorporates several advanced features including a short trigger distance for improved ergonomics, an integrated beavertail frame design for enhanced control, and the Gen5 Glock Marksman Barrel for improved accuracy. The slide features precision-milled front serrations for easier press checks and manipulation, while the tough nDLC factory finish provides excellent wear resistance. The G48 MOS also includes Glock's Slim Mounting Rail for accessories such as lights or lasers.
Important Note: The Glock 48 MOS does not include additional optic adapter plates. Optic mounting plates must be purchased separately based on your chosen optic system.
Why the S15 Magazine System Changes Everything
The heart of every Shield Arms Custom Glock 48 MOS is our revolutionary S15 magazine system. While factory Glock 48 magazines hold just 10 rounds, the S15 magazine holds 15 rounds—a 50% increase in capacity without increasing grip width or overall dimensions. This is achieved through our innovative dual-stack design that maintains the slim profile essential for comfortable concealed carry.
Constructed from heat-treated steel with a black oxide finish, S15 magazines deliver durability and reliability that matches or exceeds OEM standards. Each magazine is backed by our "Spring for Life" guarantee, ensuring your magazines will function flawlessly for the life of your firearm. The S15 system requires the included Standard S-Series Magazine Catch for proper operation—this critical component is included in all Custom Glock 48 MOS packages.
Technical Specifications
| Specification |
Details |
| Caliber |
9x19mm Luger (9mm) |
| Magazine Capacity |
15 rounds (S15 magazines) |
| Barrel Length |
4.17 inches (standard) / 4.49 inches (threaded - Elite package) |
| Overall Length |
7.28 inches |
| Height |
5.04 inches |
| Width |
1.10 inches |
| Weight (Unloaded) |
Approximately 20.74 oz |
| Slide Finish |
nDLC (standard) or Custom Cerakote |
| Trigger |
Glock Safe Action (standard) / McNally Trigger (Elite package) |
| Sights |
Glock standard (Enhanced) / Ameriglo I-Dot Night Sights (Pro & Elite) |
| Optics Ready |
Yes - MOS system compatible with micro red dots |
| Accessory Rail |
Glock Slim Mounting Rail |
| Included Magazines |
Two (2) S15 15-round magazines |
| Warranty |
100% Lifetime Warranty |
| Manufacturing |
Custom built in USA by Shield Arms |
Capacity Comparison
| Configuration |
Magazine Capacity |
Total Capacity (Mag + 1) |
| Factory Glock 48 MOS |
10 rounds |
11 rounds |
| Shield Arms Custom Glock 48 MOS |
15 rounds |
16 rounds |
| With S15 +5 Extension |
20 rounds |
21 rounds |
Frequently Asked Questions
What's included with my Custom Glock 48 MOS purchase?
All packages include the Glock 48 MOS pistol, two S15 15-round magazines, and the Black Nitride Standard Steel Magazine Catch. The Pro-Carry Package adds Ameriglo I-Dot Night Sights and Shield Arms Carry Magwell. The Elite-Carry Package includes all Pro-Carry features plus a Black Nitride Threaded Barrel and McNally Trigger. The pistol ships in the original Glock case with all standard Glock accessories.
Do I need the special magazine catch for S15 magazines?
Yes, the S15 magazine system requires the Standard S-Series Magazine Catch for proper function and reliability. This essential component is included in all Custom Glock 48 MOS packages. The factory Glock magazine catch is not compatible with S15 magazines and must be replaced—we handle this installation as part of your custom build.
Can I use factory Glock 48 magazines in my custom pistol?
No, once the S-Series Magazine Catch is installed, the pistol will only accept S15 magazines. The Standard S-Series Magazine Catch is specifically designed for S15 magazine geometry and will not reliably retain factory Glock magazines. This ensures optimal performance with the superior 15-round S15 system.
What optics are compatible with the MOS system?
The Glock 48 MOS accepts most popular micro red dot optics including Trijicon RMRcc, Holosun 407K/507K, Shield RMSc, Swampfox Sentinel, and similar micro optics. Mounting plates are required and sold separately—the pistol does not include adapter plates. Consult your optic manufacturer for the correct mounting plate.
How long does it take to receive my custom pistol?
Custom build time varies based on current demand and selected options. Cerakote finishes require additional processing time. After your order is placed, we'll provide an estimated completion date. All pistols must ship to a licensed FFL dealer in compliance with federal firearms laws.
What is the difference between the three package levels?
The Enhanced Package provides core capacity upgrades with S15 magazines and magazine catch. The Pro-Carry Package adds upgraded night sights and carry magwell for improved handling and low-light capability. The Elite-Carry Package is our complete build, adding a threaded barrel for suppressor use and McNally Trigger for enhanced performance. Choose based on your intended use and budget.
Is the threaded barrel in the Elite Package compatible with suppressors?
Yes, the Black Nitride Threaded Barrel included in the Elite-Carry Package features standard 1/2x28 TPI threading compatible with most 9mm suppressors and muzzle devices. The barrel is approximately 4.49 inches in length. Always ensure your suppressor is rated for 9mm and properly attached before firing.
Are S15 magazines legal in my state?
S15 magazines are legal in most states, but some jurisdictions restrict magazine capacity to 10 rounds or less. It is your responsibility to verify that 15-round magazines are legal in your location before purchasing. Shield Arms is not responsible for ensuring compliance with local laws.
What warranty covers my Custom Glock 48 MOS?
Your custom pistol is covered by Glock's factory warranty for the firearm itself. All Shield Arms components including S15 magazines, magazine catch, magwell, and any other Shield Arms parts are backed by our 100% lifetime warranty. S15 magazines specifically include our "Spring for Life" guarantee.
Can I add more S15 magazines to my order?
Absolutely. We recommend keeping multiple loaded magazines for defensive use. Additional S15 magazines can be added to your order, or consider the S15 Combo Pack 2 which includes three S15 magazines and one S15 +5 Extension for excellent value.
What makes Shield Arms Custom Glock builds different from other custom shops?
Shield Arms specializes in Glock 43X/48 platform optimization and designed the S15 magazine system specifically for these pistols. Our custom builds integrate components we design, manufacture, and test in-house. Every pistol is assembled by our team with attention to detail and quality control. Combined with our lifetime warranty and made-in-USA manufacturing, you're getting expertise and support unmatched by general custom shops.
How does the Carry Magwell affect concealability?
The Shield Arms Carry Magwell is specifically designed to maintain the slim profile of the Glock 48 while providing a beveled magazine opening for faster reloads. Unlike full-size competition magwells, the Carry Magwell adds minimal dimensions and does not compromise concealment. It's an ideal upgrade for defensive carry use.
Who Should Buy the Custom Glock 48 MOS
- Concealed Carry Permit Holders who want maximum capacity in a slim, easily concealed package for everyday defensive carry
- Law Enforcement Officers seeking a reliable backup or off-duty pistol with greater capacity than standard subcompact options
- Competitive Shooters in Carry Optics or similar divisions who need a compact, high-capacity pistol ready for optics mounting
- Home Defense users who want a compact pistol with full-size capacity and suppressor compatibility (Elite Package)
- Glock 48 MOS Owners looking to upgrade their existing pistol with proven aftermarket enhancements in a complete package
- First-Time Custom Gun Buyers who want a professionally built custom pistol without the hassle of sourcing and installing individual components
- Firearms Enthusiasts who appreciate quality American manufacturing, custom finishes, and enhanced capability over factory specifications
Professional Custom Build Process
Every Shield Arms Custom Glock 48 MOS is built to order by our experienced team. We begin with a factory-new Glock 48 MOS and perform all customization work in-house, including component installation, function testing, and optional Cerakote application. Each pistol undergoes quality control inspection before shipping to ensure it meets our exacting standards. When you receive your custom pistol, it's ready for the range or holster—no additional work required.
Our team has extensive experience with the Glock 43X/48 platform and the S15 magazine system. We designed the S15 magazines and understand the nuances of optimizing these pistols for peak performance. This expertise ensures your custom build will function reliably and deliver the performance advantage you expect. For detailed information about maintaining your custom pistol, visit our installation and maintenance guides.
Expand Your Custom Glock 48 MOS System
Enhance your Custom Glock 48 MOS with these complementary Shield Arms products:
- Additional S15 Magazines - Keep multiple loaded magazines ready for training or defensive use. The foundation of your increased capacity system.
- S15 +5 Magazine Extension - Transform any S15 magazine into a 20-round configuration for maximum capacity. Ideal for range use, home defense, or competition shooting.
- S15 Combo Pack 2 - Excellent value package including three S15 magazines and one S15 +5 Extension. Perfect for building your magazine inventory.
- Shield Arms Carry Magwell - If you chose the Enhanced Package, upgrade to the Carry Magwell for faster, more reliable reloads without compromising concealability (included in Pro and Elite packages).
- Micro Red Dot Optic - Take advantage of the MOS system with a quality micro red dot sight. Popular options include Trijicon RMRcc, Holosun 407K/507K, or Shield RMSc. Remember to purchase the appropriate mounting plate for your chosen optic.
- Weapon-Mounted Light - The Glock Slim Mounting Rail accepts compact weapon lights for low-light capability. Consider options from Streamlight, SureFire, or Olight designed for slim-frame pistols.
Made in USA with Lifetime Warranty
Shield Arms is proud to design and manufacture all our products in the United States. Every component we produce—from S15 magazines to magazine catches to magwells—is made domestically to the highest quality standards. Your Custom Glock 48 MOS includes Shield Arms components backed by our 100% lifetime warranty. S15 magazines carry our exclusive "Spring for Life" guarantee, ensuring they'll function reliably for the life of your pistol.
We stand behind our products because we design, test, and manufacture them ourselves. When you choose a Shield Arms Custom Glock 48 MOS, you're investing in American craftsmanship, innovative engineering, and a company committed to supporting your purchase for life. Experience the Shield Arms difference—superior capacity, quality components, and unwavering support.
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