What is the S15 Combo Pack 4?
The S15 Combo Pack 4 is the most comprehensive magazine upgrade system available for Glock 43X and 48 pistols. This complete all-in-one kit includes three S15 Gen 3 magazines (15 rounds each), two anodized aluminum +5 extensions for creating dual 20-round magazines, and one black nitride steel magazine catch—everything required for a complete high-capacity transformation with no additional purchases necessary.
Complete System Included:
- 3× S15 Gen 3 Magazines (15 rounds each)
- 2× Anodized +5 Magazine Extensions (create two 20-round magazines)
- 1× Black Nitride Steel Magazine Catch (essential for S15 compatibility)
- Complete installation hardware and detailed instructions
Optional Performance Upgrades:
The Ultimate Complete Upgrade System
The S15 Combo Pack 4 represents the definitive solution for Glock 43X and 48 owners who demand maximum performance without the complexity of sourcing individual components. Unlike other combo packs that leave you searching for additional required parts, this comprehensive system includes every essential component needed for a complete transformation: three latest-generation S15 Gen 3 magazines, two precision-manufactured magazine extensions, and critically—the steel magazine catch that is absolutely required for proper S15 magazine function and reliability.
This carefully engineered package enables you to configure dual 20-round extended capacity magazines while maintaining one standard 15-round magazine, providing unmatched versatility for competitive shooting, intensive training, tactical applications, and everyday carry. The included black nitride steel magazine catch replaces the OEM polymer catch and is specifically designed to properly engage and release S15 magazines, ensuring reliable function under all conditions. With two +5 extensions in the kit, you achieve maximum system capacity with two 20-round magazines available simultaneously—a configuration that provides decisive advantages in USPSA Carry Optics, IPSC competition, high-volume training sessions, and any application where ammunition capacity and reduced reload frequency translate directly to performance improvements.
Every component in the S15 Combo Pack 4 is precision-manufactured in the USA using premium materials: heat-treated steel magazine bodies for exceptional durability, CNC-machined aluminum extensions with anodized finishes for corrosion resistance, and black nitride-coated steel magazine catch for long-term reliability. This integrated system approach ensures optimal compatibility and performance across all components, eliminating potential issues that can arise when mixing parts from different manufacturers or generations. Backed by Shield Arms' 100% lifetime warranty and "Spring for Life" guarantee, the S15 Combo Pack 4 represents exceptional value and the most convenient path to transforming your slim-frame Glock into a high-capacity, competition-ready platform.
Key Features
- Complete System Integration: Every component required for full S15 upgrade included—no additional purchases necessary
- Dual 20-Round Configuration: Two magazine extensions enable simultaneous deployment of two 20-round magazines for maximum capacity
- Essential Steel Magazine Catch Included: Black nitride steel catch specifically engineered for proper S15 magazine engagement and release
- Versatile Capacity Options: Configure two extended 20-round magazines plus one standard 15-round magazine for mission-specific applications
- Gen 3 Technology: Latest generation S15 magazines with documented reliability improvements and enhanced feeding characteristics
- Premium Component Quality: Heat-treated steel magazines, anodized aluminum extensions, nitride-coated steel catch
- Maximum System Value: Complete kit pricing provides substantial savings compared to purchasing components individually
- Competition Optimized: Engineered specifically for USPSA, IPSC, IDPA, and competitive shooting where capacity advantages are critical
- Professional Grade Manufacturing: Precision manufactured in the USA with rigorous quality control standards
Why the Steel Magazine Catch is Essential
Critical System Component: S15 magazines absolutely require a steel magazine catch for proper function. The OEM Glock polymer magazine catch is not compatible with S15 magazines and will result in unreliable magazine retention and release.
The S15 Combo Pack 4 includes a black nitride steel magazine catch as an integral system component, ensuring you have everything needed for complete installation and reliable operation. This steel catch provides:
- Proper S15 Engagement: Specifically engineered geometry for correct S15 magazine locking and release
- Enhanced Durability: Steel construction withstands the demands of high-volume use and competitive shooting
- Reliable Function: Consistent magazine retention and positive release under all operating conditions
- Long-Term Performance: Black nitride coating provides superior corrosion resistance and wear protection
- Professional Quality: Manufactured to the same exacting standards as all Shield Arms components
Optional Upgrade: If you prefer enhanced ergonomics and improved magazine release characteristics, consider upgrading to the Premium S-Series Steel Mag Catch, which features optimized geometry for faster magazine changes during competition.
Complete System Warranty and Quality Assurance
Every component in the S15 Combo Pack 4 is manufactured in the USA and backed by Shield Arms' comprehensive quality guarantees. All magazines and the magazine catch are covered by our 100% lifetime warranty against defects in materials and workmanship. Magazine springs are additionally protected by our exclusive "Spring for Life" guarantee, providing free spring replacements for the life of your magazines. This complete coverage ensures your investment is protected and demonstrates our confidence in the quality and reliability of every component in this system.
Ideal Applications and Target Users
The S15 Combo Pack 4 excels across demanding shooting disciplines and applications where maximum capacity and complete system integration provide measurable advantages:
- USPSA Carry Optics Competition: Dual 20-round magazines dramatically reduce reload frequency during stages while maintaining division compliance
- IPSC and IDPA Competition: Maximum ammunition capacity provides strategic advantages across diverse course designs and competitive scenarios
- High-Volume Training Programs: Extended capacity magazines reduce reload interruptions during intensive practice sessions and skill development
- Professional Firearms Instruction: Complete system reliability essential for demonstration and extended shooting exercises
- Tactical Training Courses: Multiple capacity configuration options support varied training objectives and tactical scenarios
- Law Enforcement Training: Enhanced capacity and reliability for duty preparation and qualification requirements
- Competitive Shooting Sports: Proven performance trusted by championship-level competitors across multiple disciplines
- Advanced Personal Defense: Maximum capacity configuration for preparedness-minded individuals prioritizing defensive capability
Technical Specifications
| Specification |
Details |
| Package Contents |
3× S15 Gen 3 Magazines, 2× +5 Extensions with hardware, 1× Steel Magazine Catch |
| Standard Magazine Capacity |
15 rounds per magazine (9mm) |
| Extended Magazine Capacity |
20 rounds per magazine (with +5 extension installed) |
| Maximum System Capacity |
2× 20-round extended + 1× 15-round standard (55 total rounds) |
| Compatible Models |
Glock 43X (9mm), Glock 48 (9mm) - All generations |
| Magazine Material |
Heat-treated steel construction |
| Extension Material |
CNC-machined aluminum alloy |
| Extension Finish |
Type II Anodized |
| Magazine Catch Material |
Steel with black nitride coating |
| Magazine Generation |
S15 Gen 3 (latest technology) |
| Magazine Finish Options |
QPQ Nitrocarburizing, Silver Nickel, Black Nickel |
| Manufacturing |
Made in USA |
| Warranty Coverage |
Lifetime warranty + Spring for Life guarantee |
| Installation Complexity |
Moderate - detailed instructions provided |
System Comparison: Complete Kit vs. Individual Components
| Component/Feature |
S15 Combo Pack 4 |
Individual Purchase |
OEM Configuration |
| S15 Gen 3 Magazines |
3 included |
Purchase separately |
Not available |
| Magazine Extensions |
2 included (+5 each) |
Purchase separately |
Not available |
| Steel Magazine Catch |
1 included |
Purchase separately |
Polymer only |
| Standard Capacity |
15 rounds per magazine |
15 rounds per magazine |
10 rounds per magazine |
| Extended Capacity |
20 rounds (2 magazines) |
20 rounds (if purchased) |
Not available |
| Total System Investment |
Complete kit pricing |
Higher individual costs |
Limited capacity |
| Component Compatibility |
Guaranteed integration |
Must verify separately |
OEM only |
| Installation Hardware |
All included |
Included with each item |
N/A |
| Value Proposition |
Maximum (complete system) |
Lower (individual pricing) |
Limited capacity only |
Magazine Extension Features and Performance
The two +5 magazine extensions included in the S15 Combo Pack 4 represent precision engineering optimized for competitive shooting and demanding applications:
- +5 Round Capacity Increase: Each extension increases magazine capacity from 15 to 20 rounds for maximum ammunition availability
- CNC-Machined Precision: Manufactured from aluminum alloy to exact tolerances for perfect fit and consistent function
- Anodized Finish: Type II anodizing provides exceptional corrosion resistance and durability under harsh conditions
- Optimized Feeding Geometry: Internal design engineered for reliable ammunition feeding throughout extended capacity range
- Competition-Proven Performance: Extensively tested under match stress conditions by competitive shooters
- Straightforward Installation: Magazine disassembly and extension installation completed with basic tools and included hardware
- Lightweight Construction: Aluminum design minimizes weight increase while maintaining structural integrity
- Dual Extension Advantage: Two extensions enable simultaneous deployment of two 20-round magazines for maximum system capacity
System Configuration Options
The S15 Combo Pack 4 enables multiple magazine configuration strategies to suit specific shooting disciplines and applications:
Maximum Competition Configuration
Install both +5 extensions to create two 20-round magazines. Deploy both extended magazines during competition stages for maximum ammunition capacity and minimal reload frequency. Maintain the standard 15-round magazine as a backup or for stages where full capacity isn't required.
Balanced Training Setup
Configure two extended 20-round magazines for high-volume training sessions, reducing reload interruptions during intensive practice. Keep one standard 15-round magazine for concealed carry practice or exercises emphasizing reload speed and technique.
Tactical Application Setup
Deploy two 20-round extended magazines for maximum defensive capacity in tactical applications or preparedness scenarios. Maintain one standard capacity magazine for everyday carry situations where reduced profile is advantageous.
Versatile Mixed Configuration
Install one extension for a primary 20-round competition magazine. Keep two standard 15-round magazines for backup, concealed carry, or training exercises where standard capacity is preferred. This configuration provides maximum versatility across diverse shooting applications.
Frequently Asked Questions
Does this kit include everything I need for S15 magazines?
Yes, the S15 Combo Pack 4 is a complete system that includes every component required: three S15 Gen 3 magazines, two +5 magazine extensions with installation hardware, and one black nitride steel magazine catch. Unlike other combo packs, you don't need to purchase any additional components—this kit provides everything necessary for a complete upgrade of your Glock 43X or 48.
Why is the steel magazine catch included in this kit?
The steel magazine catch is an essential component for proper S15 magazine function and is included to ensure you have a complete, functional system. The OEM Glock polymer magazine catch is not compatible with S15 magazines and will result in unreliable magazine retention. The included black nitride steel catch is specifically engineered for proper S15 engagement and release, ensuring reliable operation under all conditions.
Can I upgrade to the Premium steel magazine catch instead?
Yes, if you prefer enhanced ergonomics and improved magazine release characteristics, you can substitute the included standard steel catch with our Premium S-Series Steel Mag Catch. The Premium version features optimized geometry for faster, more ergonomic magazine changes—particularly beneficial for competitive shooting. Both catches are fully compatible with S15 magazines.
How difficult is the complete system installation?
Installation requires moderate mechanical ability but is straightforward with the provided instructions. The steel magazine catch installation involves field-stripping your Glock slide to access the magazine catch mechanism—a process that takes 5-10 minutes with basic tools. Magazine extension installation requires disassembling each magazine, installing the extension components with included hardware, and reassembling with the extended springs. Complete installation typically takes 20-30 minutes. Detailed step-by-step instructions are provided, and additional guidance is available on our installation guides page.
Should I install both extensions or save one for later?
This depends on your primary application. Competitive shooters typically install both extensions immediately to maximize capacity and minimize reload frequency during competition. If you use your Glock for both competition and concealed carry, consider installing one extension for competition while maintaining two standard capacity magazines for carry. The extensions can be installed and removed as needed, though most users find their preferred configuration and maintain it.
What's the advantage over buying components individually?
The S15 Combo Pack 4 provides significant value advantages: substantial cost savings compared to individual component pricing, guaranteed compatibility of all components working together, convenience of single purchase with everything included, and assurance that you have every required component for a complete functional system. This eliminates the risk of ordering incorrect components or discovering missing required parts after beginning installation.
Are the magazine extensions legal in all states?
Magazine capacity restrictions vary significantly by state and local jurisdiction. While the standard 15-round S15 magazines may be restricted in states with magazine capacity limits, the 20-round extended configuration faces additional restrictions in more jurisdictions. Purchasers are solely responsible for ensuring compliance with all applicable federal, state, and local laws regarding magazine capacity. Shield Arms does not ship magazines to addresses in jurisdictions with applicable restrictions.
Can I purchase additional magazine extensions later?
Yes, additional +5 magazine extensions are available for separate purchase if you wish to extend the third magazine or acquire spare extensions. However, the S15 Combo Pack 4 is specifically designed to provide two extensions for optimal versatility—two extended magazines for competition or training, plus one standard capacity magazine for concealed carry or backup applications.
How does the warranty cover all components?
Every component in the S15 Combo Pack 4 is covered by Shield Arms' 100% lifetime warranty against defects in materials and workmanship. This includes all three magazines, both magazine extensions, and the steel magazine catch. Additionally, the magazine springs are covered by our exclusive "Spring for Life" guarantee, providing free replacement springs for the life of your magazines. This comprehensive coverage ensures your complete system investment is protected.
Will this affect my Glock's reliability?
When properly installed, the S15 system maintains or enhances reliability compared to OEM magazines. The steel magazine catch ensures proper magazine retention and release, while the Gen 3 magazines incorporate proven reliability improvements. The magazine extensions are engineered for consistent feeding throughout the extended capacity range. However, as with any modification, we strongly recommend comprehensive function testing with your chosen ammunition before relying on this system for competition or defensive purposes.
Can I still use OEM Glock magazines after installing the steel catch?
Yes, once you install the steel magazine catch for S15 compatibility, your Glock will still accept and function with OEM Glock magazines in most instances, but will cause increased wear on the polymer magazine.
Who Should Buy the S15 Combo Pack 4
- Serious Competitive Shooters: USPSA, IPSC, IDPA, and other competitive disciplines where dual 20-round magazine capacity and complete system integration provide measurable performance advantages
- Competition New Entrants: Shooters entering competitive disciplines who need a complete magazine system without the complexity of sourcing individual components
- High-Volume Training Enthusiasts: Dedicated practitioners who require extended capacity magazines for intensive training sessions and want maximum system capacity
- Firearms Instructors and Range Officers: Professionals conducting training courses who benefit from reduced reload frequency during demonstrations and extended shooting exercises
- Tactical Training Participants: Students and professionals in tactical training programs requiring maximum ammunition capacity for diverse scenario training
- Law Enforcement Officers: Duty and off-duty personnel seeking enhanced capacity for qualification, training, and tactical applications
- Preparedness-Focused Individuals: Those prioritizing maximum defensive capability and ammunition availability in their carry setup
- Value-Conscious Upgraders: Glock 43X/48 owners who want complete system transformation with guaranteed component compatibility at optimal pricing
- First-Time S15 Buyers: Anyone new to the S15 platform who wants assurance they have every required component for successful installation and operation
Complete System Installation and Setup
Installing the S15 Combo Pack 4 involves two primary procedures: steel magazine catch installation and magazine extension installation. The magazine catch installation requires field-stripping your Glock slide to access the magazine catch mechanism, removing the OEM polymer catch, and installing the included steel catch—a straightforward process that takes 5-10 minutes with basic tools and proper guidance.
Magazine extension installation involves disassembling each magazine you wish to extend, installing the extension body with included hardware, replacing the standard spring with the included extended spring, and reassembling the magazine. This process is straightforward with the provided instructions and takes approximately 5-7 minutes per magazine once you're familiar with the procedure.
After installation, comprehensive function testing is essential. Test each magazine with your chosen ammunition, verifying reliable feeding, proper magazine retention and release, and consistent function across the entire capacity range. This testing should be performed at the range under realistic conditions before relying on the system for competition or defensive applications.
For detailed visual guides, step-by-step instructions, and troubleshooting assistance, visit our comprehensive installation guides page, where you'll find documentation for both magazine catch installation and magazine extension assembly.
Performance Enhancement Products and Accessories
Maximize your S15 Combo Pack 4 system performance with these complementary Shield Arms products and accessories:
- Premium S-Series Steel Mag Catch for Glock 43X/48 - Upgrade from the included standard steel catch to our Premium version featuring enhanced ergonomic geometry for faster, more intuitive magazine releases during competition. The Premium catch provides measurable advantages in reload speed and consistency for serious competitive shooters.
- Carry Magwell for Glock 43X/48 - Enhance reload speed and consistency with our Carry Magwell, designed to guide magazines smoothly into the magazine well while maintaining a compact profile suitable for concealed carry. The magwell improves reload reliability under stress and pairs perfectly with the S15 system for enhanced performance.
- Premium Magwell for Glock 43X/48 - For competition applications, our Premium Magwell provides maximum reload performance with an enlarged funnel opening and optimized geometry for lightning-fast magazine changes. This competition-grade magwell is specifically engineered for competitive shooting disciplines where reload speed directly impacts stage times and competitive placement.
- S15 Magazine for Glock 43X/48 - Add additional S15 Gen 3 magazines to your inventory for extended training sessions, backup competition magazines, or building a complete magazine rotation. Many competitive shooters maintain 5-6 magazines for major matches and intensive training programs.
Building a complete magazine and handling system ensures you're fully prepared for any competitive shooting discipline, training program, or tactical application. The combination of the S15 Combo Pack 4 with a premium magwell represents the ultimate reload performance configuration for your Glock 43X or 48.
Competition Performance Advantages
The S15 Combo Pack 4 delivers quantifiable performance advantages in competitive shooting environments where capacity and reload frequency directly impact stage times and competitive placement. The dual 20-round extended capacity configuration dramatically reduces reload requirements during USPSA Carry Optics and IPSC stages—often eliminating one or more reloads compared to competitors using OEM 10-round magazines, or even competitors using standard 15-round S15 magazines without extensions.
Championship-level competitive shooters consistently report that the S15 system provides reliability equal to or exceeding OEM magazines while delivering the capacity advantages that translate directly to improved stage performance, reduced time penalties, and competitive edge. The Gen 3 improvements ensure consistent feeding across the diverse ammunition types used in competition, from light-recoiling 115-grain competition loads to full-power 147-grain defensive ammunition used in certain divisions.
The complete system approach of the S15 Combo Pack 4—with all components engineered to work together—eliminates potential compatibility issues and ensures optimal performance from your first match. This integrated design philosophy has made the S15 system the choice of competitive shooters at local, regional, and national championship levels across multiple shooting disciplines.
Why Choose the S15 Combo Pack 4
The S15 Combo Pack 4 represents the most comprehensive, convenient, and cost-effective solution for Glock 43X and 48 owners seeking maximum performance and complete system transformation. Unlike other combo packs or piecemeal component purchases, this complete kit includes every essential element: three latest-generation magazines, two magazine extensions for dual 20-round capacity, and critically—the steel magazine catch required for proper S15 function.
This all-inclusive approach eliminates the frustration of discovering missing required components mid-installation, ensures guaranteed compatibility of all system elements, and provides substantial cost savings compared to individual component pricing. Every part is precision-manufactured in the USA to exacting quality standards and backed by comprehensive warranty coverage including our lifetime warranty and Spring for Life guarantee.
Whether you're a competitive shooter seeking maximum capacity advantages, a training enthusiast requiring extended capacity for intensive practice, a tactical professional demanding reliable high-capacity performance, or simply a Glock 43X/48 owner who wants the absolute best magazine system available—the S15 Combo Pack 4 delivers complete transformation with professional-grade performance and unmatched convenience.
Experience the ultimate Glock 43X/48 upgrade with the S15 Combo Pack 4—complete system integration, dual 20-round capacity, professional performance, everything included for serious shooters who refuse to compromise.
