Quick Answer
What is the Shield Arms Custom Glock 43X MOS? A professionally customized Glock 43X MOS built around the revolutionary S15 15-round magazine system, featuring hand-selected upgraded components installed by Shield Arms technicians. Available in three packages (Enhanced, Pro-Carry, Elite) with optional custom Cerakote finishes. Every pistol is individually built, tested, and ready for concealed carry or competition use.
The Shield Arms Custom Glock 43X MOS represents the pinnacle of concealed carry perfection - a purpose-built pistol featuring professionally installed upgraded components and custom modifications by the Shield Arms team. Built around our proven S15 15-round magazine system, these custom pistols deliver 50% more capacity than factory Glock 43X MOS models, elevating your concealed carry and shooting experience to the next level.
Each custom build is hand-assembled by Shield Arms technicians who carefully select, install, and test every component to ensure flawless operation. Whether you choose the Enhanced Package for maximum capacity, the Pro-Carry Package for improved ergonomics and visibility, or the Elite Package for competition-ready performance, you're getting a complete, professionally built pistol ready for immediate use.
Why Choose a Shield Arms Custom Build?
- Professional installation: All components installed by experienced Shield Arms gunsmiths
- Quality control: Every pistol is individually function-tested and inspected
- Perfect compatibility: Components selected and matched for optimal performance
- S15 magazine system: 15-round capacity vs 10-round OEM (50% increase)
- Custom Cerakote options: Unique finishes applied in-house
- Ready to carry: No additional modifications or assembly required
- Comprehensive packages: Everything you need in one complete pistol
- Warranty backed: Shield Arms lifetime warranty on all custom work
Custom Package Options
Enhanced Package - Maximum Capacity Foundation
The perfect starting point for shooters who want the revolutionary S15 capacity advantage with professional installation:
What's Included:
Key Benefits:
- 50% more capacity than factory Glock 43X (15 vs 10 rounds)
- Maintains slim, concealable profile
- Professional mag catch installation ensures proper function
- Foundation for future upgrades
- MOS optics-ready platform
Best For: Shooters wanting maximum capacity in a professionally built package, or those planning to add their own preferred sights and accessories later.
Pro-Carry Package - Enhanced Visibility & Ergonomics
The ideal concealed carry configuration with upgraded night sights and improved reload speed:
What's Included:
Key Benefits:
- All Enhanced Package benefits plus:
- Superior low-light sight acquisition with tritium night sights
- Faster, more reliable magazine changes with carry magwell
- Improved control and confidence in defensive scenarios
- Rounded magwell edges prevent printing during concealed carry
- Professional installation of all components
Best For: Serious concealed carriers who demand superior visibility, faster reloads, and maximum capacity in a complete, professionally built package.
Elite-Carry Package - Competition-Ready Performance
The ultimate custom Glock 43X MOS configuration with premium trigger, threaded barrel, and complete performance upgrades:
What's Included:
Key Benefits:
- All Pro-Carry Package benefits plus:
- Dramatically improved trigger feel with McNally flat-faced trigger
- Suppressor-ready with threaded barrel
- Competition-level performance in concealed carry package
- Enhanced accuracy from premium trigger
- Complete, fully optimized carry or competition pistol
- Professional installation and testing of all components
Best For: Competitive shooters, serious enthusiasts, and discerning carriers who demand the absolute best performance from their Glock 43X MOS platform.
Custom Cerakote Finish Options
Each Shield Arms Custom Glock 43X MOS can be finished in your choice of premium Cerakote coatings, applied in-house by skilled technicians. Every custom Cerakoted pistol is truly unique, featuring durable finishes that resist wear, corrosion, and the elements.
Available Cerakote Finishes
Black (Default - Factory Glock nDLC Finish)
- Factory Glock nDLC coating (not Cerakoted)
- Durable, proven finish
- Classic tactical appearance
- No additional cost
Fallout
- Post-apocalyptic tactical pattern
- Multi-tone distressed finish
- Unique weathered aesthetic
- Applied in-house by Shield Arms
Montana Mud
- Earth-tone camouflage pattern
- Blends natural browns and tans
- Inspired by Montana terrain
- Ideal for hunting or outdoor carry
Pineland
- Woodland inspired esthetic
- Forest green tone
- Named after Special Forces training area
- Tactical woodland aesthetic
Cerakote Benefits:
- Superior corrosion and wear resistance
- Chemical and solvent resistant
- Enhanced grip texture
- UV stable - won't fade
- Professional in-house application
- Each pistol is unique
About the Glock 43X MOS Platform
The foundation of every Shield Arms custom build is the legendary Glock 43X MOS, featuring precision slide cuts for micro-optics and the Glock Slim Mounting Rail for accessories. Chambered in 9x19mm, it's the perfect tactical partner in Glock's well-known Slimline design, offering superior concealability and comfort.
Factory Glock 43X MOS Features
- MOS (Modular Optic System): Precision-milled optics cut accepts micro red dot sights
- Slim Mounting Rail: Accessory rail for lights or lasers
- Compact grip, subcompact barrel: Balanced, minimal-profile carry pistol
- Short trigger distance: Improved ergonomics for smaller hands
- Built-in beavertail: Enhanced grip and recoil control
- Glock Marksman Barrel (GMB): Match-grade accuracy from Gen5 series
- nDLC slide finish: Tough, corrosion-resistant coating
- Precision-milled front serrations: Enhanced slide manipulation
- Gen5 trigger system: Smooth trigger pull with safe action
Note: The G43X MOS does not include additional MOS adapter plates. Optic mounting plates sold separately.
Technical Specifications
| Base Pistol |
Glock 43X MOS (Factory New) |
| Caliber |
9x19mm (9mm Luger) |
| Capacity (S15 Magazines) |
15+1 rounds |
| Capacity (OEM Comparison) |
10+1 rounds (50% increase with S15) |
| Barrel Length |
3.41 inches (subcompact) |
| Overall Length |
6.50 inches |
| Height |
5.04 inches |
| Width |
1.10 inches (Slimline profile) |
| Slide Width |
0.87 inches |
| Weight (Unloaded) |
Approximately 18.7 oz (varies by package) |
| Trigger Pull |
~5.5 lbs (Enhanced/Pro-Carry), varies (Elite w/ McNally) |
| Optics Cut |
MOS system for micro red dots |
| Rail |
Glock Slim Mounting Rail |
| Magazines Included |
2x S15 Gen 3 15-round magazines |
| Finish Options |
Black, Fallout, Montana Mud, Pineland |
| Custom Build |
Hand-assembled by Shield Arms technicians |
| Warranty |
Glock Limited Warranty + Shield Arms Lifetime on custom work |
| Made In |
Austria (Glock), USA (Custom work & components) |
Package Comparison
| Component |
Enhanced |
Pro-Carry |
Elite-Carry |
| Glock 43X MOS |
✓ |
✓ |
✓ |
| S15 15rd Magazines (2) |
✓ |
✓ |
✓ |
| Steel Mag Catch |
✓ |
✓ |
✓ |
| Night Sights |
— |
✓ |
✓ |
| Carry Magwell |
— |
✓ |
✓ |
| Threaded Barrel |
— |
— |
✓ |
| McNally Trigger |
— |
— |
✓ |
| Best For |
Capacity upgrade |
CCW optimization |
Competition/Elite |
S15 Magazine System Advantage
Every Shield Arms Custom Glock 43X MOS is built around our revolutionary S15 magazine system - the key differentiator that sets these pistols apart from factory Glocks:
- 50% more capacity: 15 rounds vs 10 rounds OEM in same flush-fit length
- Patented staggered-round geometry: Maximizes space efficiency
- Premium steel construction: Enhanced durability over polymer OEM magazines
- Gen 3 improvements: US-based manufacturing, enhanced tolerances, raised positioning ribs
- Flush-fit profile: Maintains Glock's slim, concealable design
- Steel mag catch included: Required for S15 function, professionally installed
- Lifetime warranty + Spring for Life: Free replacement springs forever
Learn more about the S15 magazine system →
Professional Custom Build Process
Each Shield Arms Custom Glock 43X MOS undergoes a meticulous build and testing process:
- Component Selection: Factory new Glock 43X MOS inspected and verified
- Custom Work: Cerakote finish applied if selected (cured and inspected)
- Component Installation: Steel mag catch, sights, magwell, barrel, trigger installed by experienced technicians
- Quality Control: Every pistol inspected for proper fit, finish, and function
- Function Testing: Trigger pull verified, magazine function tested, slide operation checked
- Test Fire: Each pistol is test fired with the included magazines to confirm function
- Final Inspection: Complete pistol evaluated to Shield Arms standards
- Packaging: Pistol packaged with S15 magazines, case, and documentation
Complete Your Custom Build
Enhance your Shield Arms Custom Glock 43X MOS with these complementary accessories:
- Additional S15 Magazines - Build your magazine collection
- S15 +5 Extension - Increase capacity to 20 rounds for competition
- Premium Steel Mag Catch - Upgrade to hand-specific design (Elite package only)
- MOS Adapter Plates - Mount your preferred micro red dot sight
- Weapon Lights - Utilize the Slim Mounting Rail for tactical illumination
- Holsters - Custom-fit holsters for your specific package configuration
Frequently Asked Questions
What's the difference between buying a custom build vs. buying components separately?
The custom build includes professional installation by Shield Arms technicians, complete function testing, and guaranteed component compatibility. All work is covered under Shield Arms warranty. Buying a factory Glock and installing components yourself requires technical knowledge, tools, and time - plus you assume responsibility for proper installation.
Can I request specific components not listed in the packages?
The three packages represent our most popular configurations. For custom component requests beyond these packages, please contact Shield Arms customer service to discuss custom build options and pricing.
How long does it take to build and ship a custom Glock 43X MOS?
Build times vary based on current demand and whether Cerakoting is selected. Custom Cerakote finishes add additional processing time for application and curing. Contact customer service for current lead times.
Does the MOS come with optic mounting plates?
No. The Glock 43X MOS does not include MOS adapter plates. Adapter plates for your specific optic must be purchased separately. Most micro red dot manufacturers include Glock MOS-compatible plates with their optics.
Can I use OEM Glock magazines with the custom build?
No. The Shield Arms steel mag catch is designed specifically for S15 magazine geometry and is not compatible with OEM Glock magazines. Once installed, you must use S15 magazines exclusively. The two included S15 magazines provide 15-round capacity vs 10-round OEM.
What warranty covers the custom build?
The Glock pistol is covered by Glock's limited warranty. All Shield Arms custom work, installed components, and S15 magazines are covered by Shield Arms' lifetime warranty against manufacturing defects. S15 magazines also include our Spring for Life guarantee.
Can I choose a different color magwell or magazine extension?
The packages include specific components as listed. The Carry Magwell comes in black anodized finish. For color-matched magazine extensions or custom component options, contact customer service to discuss possibilities.
Is the threaded barrel suppressor-ready?
Yes. The threaded barrel included in the Elite-Carry Package features standard 1/2x28 threads compatible with most 9mm suppressors and muzzle devices. A thread protector is included.
How does the McNally trigger compare to the factory Glock trigger?
The McNally trigger features a flat-faced design with a crisper break, shorter reset, and reduced take-up compared to the factory Glock trigger. It's designed for improved accuracy and faster follow-up shots while maintaining Glock reliability and safety.
Can I purchase additional S15 magazines later?
Absolutely. S15 magazines are available separately in various finishes (Nitrocarb, Silver Nickel, Black Nickel). We recommend having at least 3-4 magazines for training and carry rotation.
Are these pistols legal in my state?
The Glock 43X MOS is legal in most states. However, some jurisdictions have restrictions on magazine capacity, threaded barrels, or specific firearm features. The 15-round S15 magazines exceed capacity limits in some states. Please verify your local and state laws before purchasing. Shield Arms cannot ship to restricted locations.
Who Should Buy a Shield Arms Custom Glock 43X MOS?
Enhanced Package:
- Shooters wanting maximum capacity with professional installation
- Those planning to add their own preferred sights and accessories later
- Budget-conscious buyers seeking the S15 advantage
- Concealed carriers prioritizing capacity over accessories
Pro-Carry Package:
- Serious concealed carriers demanding complete carry optimization
- Shooters who need superior low-light sight acquisition
- Anyone wanting faster reloads without DIY installation
- Professionals requiring a ready-to-carry defensive pistol
Elite-Carry Package:
- Competitive shooters in USPSA Carry Optics or IDPA
- Enthusiasts wanting the absolute best Glock 43X MOS configuration
- Suppressor users needing threaded barrel capability
- Shooters demanding premium trigger performance
- Anyone seeking a complete, no-compromise custom build
Why Choose Shield Arms Custom Builds?
Shield Arms revolutionized the Glock 43X/48 platform with the patented S15 magazine system. Our custom builds take this innovation further by combining professional installation, hand-selected components, and rigorous quality control to deliver pistols that exceed factory specifications.
Every custom Glock 43X MOS is built by experienced technicians who understand the nuances of these pistols and how components interact. From Cerakote application to final function testing, we ensure every detail meets our exacting standards. The result is a complete, professionally built pistol ready for concealed carry, competition, or tactical applications - backed by Shield Arms' reputation for innovation and quality.
Order your Shield Arms Custom Glock 43X MOS today - professional custom build, maximum capacity, superior performance, ready to carry.
