When it comes to enhancing the performance of your Glock 42, adding a red dot sight can make a significant difference. The Glock 42, being one of the most popular subcompact pistols, is often used for concealed carry and self-defense.
Its compact size and ease of handling make it an ideal candidate for a red dot sight, which can improve accuracy and target acquisition, especially in high-stress situations.
In this article, I’ll walk you through the best red dot sights for the Glock 42 available in 2025. I’ll dive deep into the specifications, highlight the top features, and share my personal experiences with each product. By the end of this guide, you’ll have a solid understanding of which red dot sight suits your Glock 42 best.
Top 6 Best Red Dot Sights for Glock 42 in 2025
1. Trijicon RMRcc
Specifications:
- Reticle: 3.25 MOA Dot
- Battery Life: Up to 4 years on a single CR2032 battery
- Waterproof: Yes, up to 66 feet
- Mounting: Requires an adapter plate
Best Features:
- Compact and lightweight, perfect for the Glock 42
- Rugged aluminum body construction
- Adjustable LED for brightness control
- Long battery life
Pros:
- Exceptional durability
- Crisp and clear reticle
- Wide field of view
- Reliable battery life
Cons:
- Requires a mounting plate
- On the pricier side
Personal Experience: The Trijicon RMRcc is my go-to choice when it comes to red dots for smaller pistols like the Glock 42. The clarity of the 3.25 MOA dot is impressive, making target acquisition quick and precise. While the need for a mounting plate adds a small layer of complexity, it’s a small price to pay for the performance you get.
Online Customer Comments: Users consistently praise the RMRcc for its ruggedness and reliability. Many owners of the Glock 42 report that once mounted, the sight holds zero exceptionally well, even after extensive use.
Mounting: The RMRcc does not mount directly to the Glock 42 and will require an adapter plate.
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2. Holosun 507K X2
Specifications:
- Reticle: 2 MOA Dot & 32 MOA Circle
- Battery Life: Up to 50,000 hours on a CR1632 battery
- Waterproof: Yes, IP67 rated
- Mounting: Directly mounts to Glock 42 with appropriate slide cut
Best Features:
- Multi-reticle system
- Solar Failsafe technology
- Shake Awake feature
Pros:
- Long battery life
- Durable construction
- Easy to use multi-reticle system
- Innovative solar power backup
Cons:
- Slightly larger profile for a subcompact
- Requires specific slide cut for direct mount
Personal Experience: I was pleasantly surprised by how intuitive the multi-reticle system is on the Holosun 507K X2. The option to switch between a 2 MOA dot and a 32 MOA circle-dot reticle allows for versatility depending on the shooting scenario. The Shake Awake feature is a fantastic addition, ensuring the sight is always ready when you are.
Online Customer Comments: The Holosun 507K X2 receives high marks from users for its reliability and feature set. Many Glock 42 owners appreciate the direct mounting option, provided their slide has the necessary cut.
Mounting: This red dot can be directly mounted to the Glock 42, assuming the slide has been appropriately cut.
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3. Shield Sights RMSc
Specifications:
- Reticle: 4 MOA Dot
- Battery Life: Up to 2–3 years on a CR2032 battery
- Waterproof: Yes
- Mounting: Directly mounts to Glock 42 with appropriate slide cut
Best Features:
- Ultra-compact design ideal for Glock 42
- Parallax-free lens
- Automatic brightness adjustment
Pros:
- Sleek, low-profile design
- Quick target acquisition
- No parallax for increased accuracy
- Automatically adjusts brightness
Cons:
- Shorter battery life compared to competitors
- Limited to 4 MOA dot only
Personal Experience: The RMSc is one of the smallest red dots you’ll find that’s still packed with features. It’s perfect for maintaining the slim profile of the Glock 42. The automatic brightness adjustment works flawlessly in varying light conditions, which is a huge plus when carrying the pistol in different environments.
Online Customer Comments: Glock 42 owners often highlight the RMSc’s compact size as a key advantage, especially for concealed carry. However, some wish for a more extended battery life.
Mounting: The RMSc can be directly mounted to the Glock 42 if the slide is cut to fit.
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4. Crimson Trace RAD Micro Pro
Specifications:
- Reticle: 3 MOA Dot
- Battery Life: Up to 10,000 hours on a CR1632 battery
- Waterproof: Yes, IPX4 rated
- Mounting: Requires an adapter plate
Best Features:
- Motion sensor for instant-on activation
- Lightweight polymer construction
- Bright and crisp 3 MOA reticle
Pros:
- Affordable price point
- Instant-on feature is highly responsive
- Lightweight, adds minimal bulk
Cons:
- Requires mounting plate
- Lower waterproof rating than others
Personal Experience: I found the instant-on feature of the Crimson Trace RAD Micro Pro particularly useful for self-defense scenarios. The sight activates as soon as it senses movement, so there’s no need to fumble with buttons in a high-stress situation. It’s also quite lightweight, which helps maintain the balance and feel of the Glock 42.
Online Customer Comments: Many users appreciate the value for money that Crimson Trace offers. The RAD Micro Pro is often praised for its quick activation and solid build quality, despite its lower price point.
Mounting: This red dot sight requires an adapter plate for mounting on the Glock 42.
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5. Vortex Venom
Specifications:
- Reticle: 3 MOA Dot
- Battery Life: Up to 30,000 hours on a CR1632 battery
- Waterproof: Yes
- Mounting: Requires an adapter plate
Best Features:
- Easy access top-load battery compartment
- Multiple brightness settings
- Wide field of view
Pros:
- Great value for the price
- User-friendly controls
- Durable aluminum construction
Cons:
- Requires a mounting plate
- Bulkier than other options
Personal Experience: The Vortex Venom is a solid performer, particularly when it comes to ease of use. The top-loading battery compartment is a thoughtful design feature, as it eliminates the need to remove the sight for battery changes. While it’s a bit bulkier than some other sights, it still fits well on the Glock 42 and offers excellent performance.
Online Customer Comments: Users often mention the ease of battery changes as a significant plus, especially for a concealed carry weapon like the Glock 42. The Venom is also noted for its durability and clear optics.
Mounting: The Vortex Venom requires an adapter plate for mounting on the Glock 42.
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6. Leupold DeltaPoint Micro
Specifications:
- Reticle: 3 MOA Dot
- Battery Life: Up to 3.5 years on a CR1632 battery
- Waterproof: Yes
- Mounting: Direct mount
Best Features:
- Extremely low profile design
- No parallax for greater accuracy
- Long battery life
Pros:
- Seamless integration with the Glock 42
- Easy to co-witness with iron sights
- Durable and reliable
Cons:
- Learning curve for the micro-sized window
- Limited to 3 MOA dot
Personal Experience: The Leupold DeltaPoint Micro offers a unique and extremely low-profile option for the Glock 42. Its design is almost flush with the slide, making it an excellent choice for those who want to keep their setup as streamlined as possible. The micro-sized window does take some getting used to, but the trade-off is a sight that maintains the pistol’s sleek lines.
Online Customer Comments: The DeltaPoint Micro is often praised for its low profile and durability. Some users note that the smaller window requires an adjustment period, but most find it to be a fair trade-off for the sight’s minimalistic design.
Mounting: This sight can be directly mounted to the Glock 42 without the need for an adapter plate.
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Choosing the Best Red Dot Sight for Your Glock 42
Selecting the right red dot sight for your Glock 42 is crucial, especially given the pistol’s role as a concealed carry and self-defense weapon. Here are some factors to consider:
- Size and Weight: Since the Glock 42 is a subcompact pistol, you’ll want to choose a red dot sight that doesn’t add unnecessary bulk. Smaller, lighter sights like the Shield Sights RMSc or Leupold DeltaPoint Micro are ideal.
- Battery Life: A long battery life is essential for a carry gun. Sights like the Holosun 507K X2 and Trijicon RMRcc offer extended battery life, ensuring your sight is always ready when you need it.
- Mounting Options: Consider whether the sight can be directly mounted to the Glock 42 or if it requires an adapter plate. Direct mounting is generally preferred for a more streamlined setup.
- Reticle Options: Some sights offer multiple reticle options, like the Holosun 507K X2, which can be advantageous depending on your shooting style and preferences.
- Durability: The sight needs to withstand the rigors of daily carry. Opt for a model known for its ruggedness, like the Trijicon RMRcc or the Vortex Venom.
Frequently Asked Questions (FAQs)
Q: Can you mount a red dot sight directly on the Glock 42?
A: Yes, but it depends on the sight. Some models, like the Leupold DeltaPoint Micro, are designed for direct mounting. Others, like the Trijicon RMRcc, require an adapter plate.
Q: Does adding a red dot sight affect the concealability of the Glock 42?
A: It can, depending on the size of the sight. Choosing a low-profile, compact sight will minimize any impact on concealability.
Q: What is the best reticle size for a Glock 42 red dot sight?
A: A 3–4 MOA dot is generally ideal, offering a good balance between quick target acquisition and precision.
Q: How often should I change the battery in my red dot sight?
A: This varies by model. For example, the Holosun 507K X2 can last up to 50,000 hours, while the Shield Sights RMSc may need a battery change every 2–3 years. It’s a good practice to replace the battery annually to ensure reliability.
Q: Is it difficult to install a red dot sight on a Glock 42?
A: Installation can be straightforward, especially if the sight mounts directly to the slide. However, if an adapter plate is required, you may need some additional tools and a bit more time.
Conclusion
Choosing the best red dot sight for your Glock 42 is a personal decision that depends on how you plan to use your firearm.
Each of the sights I’ve reviewed here offers something unique, whether it’s the rugged durability of the Trijicon RMRcc, the innovative features of the Holosun 507K X2, or the ultra-compact design of the Shield Sights RMSc.
Consider your specific needs and preferences, and you’ll find the perfect match to enhance your Glock 42’s performance.