Choosing the right pistol can be a daunting task, especially when considering modifications like optics mounting systems. Two popular options for equipping your Glock with a red dot sight are the Modular Optic System (MOS) and milled slides. This in-depth comparison will help you understand the key differences between Glock MOS and milled slides, enabling you to make an informed decision based on your needs and budget.
Understanding the Glock Modular Optic System (MOS)
Glock's Modular Optic System (MOS) pistols come factory-equipped with multiple pre-cut slide plates to accommodate various red dot sight footprints. This means you can easily swap between different optic brands without needing a gunsmith. The MOS system offers a robust and reliable solution, directly from the manufacturer, ensuring compatibility and potentially a smoother installation process. Key advantages include:
- Factory-installed: No need for aftermarket milling, saving time and potential costs.
- Interchangeable plates: Supports various red dot sight brands, offering flexibility.
- Warranty: Generally covered under Glock's standard warranty (always check the specifics).
- Ease of installation: Usually simpler than installing an optic on a milled slide.
Potential Drawbacks of the MOS System
Despite its advantages, the MOS system isn't without its limitations:
- Limited optic choices: While supporting various brands, the available footprints might not encompass every red dot sight on the market.
- Height over bore: The MOS system can add height to the optic, potentially impacting co-witness capabilities and sight picture.
- Plate reliability: While generally reliable, plate failure is theoretically possible, though rare.
Milled Slides: The Custom Approach
A milled slide involves machining the Glock slide to accept a specific red dot sight. This custom approach provides precise cuts tailored to your chosen optic, offering a potentially cleaner and lower profile mounting solution compared to the MOS system. The benefits of choosing a milled slide include:
- Custom fit: Perfectly tailored to your selected red dot sight for optimal fit and function.
- Lower profile: Can often result in a lower overall profile, improving sight picture and potentially reducing weight.
- Enhanced aesthetics: Many shooters prefer the cleaner look of a custom milled slide.
Considerations for Milled Slides
While attractive, opting for a milled slide comes with its own set of considerations:
- Cost: Milling services can be more expensive than purchasing a factory MOS pistol.
- Warranty implications: Modifying the slide can void Glock's factory warranty. Always confirm with the milling service and Glock before proceeding.
- Potential for errors: Improper milling can compromise slide integrity and firearm safety. Choosing a reputable gunsmith is crucial.
- Turnaround time: Milling services often require a waiting period for completion.
MOS vs. Milled: The Verdict
The "best" option depends entirely on your priorities and circumstances.
Choose a Glock MOS if:
- You want a factory-supported, readily available solution.
- You need compatibility with multiple red dot sight brands.
- You prioritize a quicker and simpler installation process.
- You want to maintain the Glock factory warranty.
Choose a milled slide if:
- You have a specific red dot sight in mind and want a perfect fit.
- You value a potentially lower profile and cleaner aesthetic.
- You're willing to invest more time and money for a custom solution.
- You understand and accept the potential warranty implications.
Ultimately, the choice between a Glock MOS and a milled slide comes down to individual needs and preferences. Thoroughly weigh the pros and cons of each option before making your decision. Remember to always prioritize safety and seek professional help from a qualified gunsmith if you're not comfortable with the modification process.
