When you’ve got a powerful pistol like the SIG Sauer P320 X5 Legion, you need to pair it with a red dot sight that enhances its performance, precision, and shooting experience.
Over the years, I’ve tested many red dots for handguns, but not all live up to the standard this elite competition pistol demands.
Whether you’re into competitive shooting or looking to improve your accuracy at the range, I’ve rounded up the best red dot sights of 2025 specifically for the SIG Sauer P320 X5 Legion.
Top Picks for Best X5 Legion Red Dot Sights of 2025
1. Trijicon RMR Type 2
The Trijicon RMR Type 2 is a rugged, reliable, and proven red dot sight that has earned its spot at the top. The RMR Type 2 (Ruggedized Miniature Reflex) is built like a tank but maintains a compact, lightweight design ideal for pairing with the X5 Legion. It has become the gold standard in terms of red dot performance, favored by law enforcement, military personnel, and competition shooters alike.
Specifications:
- Reticle: 3.25 MOA
- Weight: 1.2 oz
- Material: 7075-T6 aluminum
- Battery Life: Over 4 years at brightness setting 4
- Mounting: Direct mount onto X5 Legion (no additional plates required)
Best Features:
- The patented housing shape diverts the force of impact away from the lens, increasing durability.
- Auto-adjust brightness feature is excellent for transitioning between different lighting environments.
- The RMR Type 2 is also waterproof up to 20 meters, making it perfect for rugged environments.
Pros:
- Exceptional durability.
- Crisp, clear reticle.
- Wide adjustment range for windage and elevation.
Cons:
- Slightly more expensive than most other red dots.
- Battery change requires removal of the optic.
My Experience: I’ve personally used the RMR Type 2 on my X5 Legion for over a year, and it hasn’t let me down. The sight stays zeroed, even after thousands of rounds. The durability is outstanding, as I’ve dropped my pistol more than once without affecting the sight’s performance.
Customer Comments: Many users rave about the ruggedness and reliability of this optic, with several noting how it holds up during high-volume competition use.
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2. Holosun 507C X2
The Holosun 507C X2 is another excellent option for the X5 Legion, especially if you’re looking for versatility without breaking the bank. It’s packed with features usually found in more expensive models, such as multiple reticle options and solar backup, which can make a world of difference in competitive shooting.
Specifications:
- Reticle: 2 MOA dot and 32 MOA circle
- Weight: 1.5 oz
- Material: 7075 aluminum
- Battery Life: 50,000 hours
- Mounting: Requires an adapter plate for X5 Legion.
Best Features:
- Multi-reticle system (circle dot, 2 MOA dot only, or 32 MOA circle only).
- Solar Failsafe ensures it remains operational even when the battery dies.
- Shake Awake technology conserves battery by activating the sight when motion is detected.
Pros:
- Affordable for the number of features.
- Long-lasting battery life.
- Great reticle options for different shooting situations.
Cons:
- Slightly bulkier than some competitors.
- Mounting requires additional hardware.
My Experience: I found the 507C X2 to be one of the most versatile red dots I’ve tested. The reticle options were particularly useful when switching between quick target acquisition and precise shots.
Customer Comments: Many users love the Shake Awake feature and long battery life. Competitive shooters appreciate the large 32 MOA circle for fast transitions between targets.
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3. Leupold DeltaPoint Pro
The Leupold DeltaPoint Pro is a high-end red dot sight known for its crystal-clear glass and fast target acquisition. It’s one of the most popular choices among competitive shooters and pairs seamlessly with the X5 Legion.
Specifications:
- Reticle: 2.5 MOA
- Weight: 1.9 oz
- Material: Aircraft-grade aluminum
- Battery Life: 1,600 hours
- Mounting: Directly mounts to the X5 Legion.
Best Features:
- The large window provides an excellent field of view, making it easier to locate the reticle quickly.
- Motion-sensing technology helps to conserve battery life.
- It offers tool-less battery changes, unlike many other red dot sights.
Pros:
- Best-in-class clarity.
- Large field of view.
- Easy battery changes.
Cons:
- Battery life is shorter than most competitors.
- A bit heavier than other red dots.
My Experience: The DeltaPoint Pro is my go-to for precision shooting. The clear glass and large window make a noticeable difference in target acquisition speed.
Customer Comments: Many shooters praise the DeltaPoint Pro for its glass clarity, though some wish the battery life were a bit longer for the price.
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4. Vortex Venom
The Vortex Venom is an excellent budget-friendly option that doesn’t skimp on quality. With a clear 3 MOA dot and easy-to-use controls, it’s a solid choice for someone looking to enhance their X5 Legion without breaking the bank.
Specifications:
- Reticle: 3 MOA
- Weight: 1.1 oz
- Material: Aluminum alloy
- Battery Life: Up to 30,000 hours
- Mounting: Requires an adapter plate for X5 Legion.
Best Features:
- Top-load battery compartment for easy battery replacement.
- Ten brightness levels, so you can adjust to any lighting situation.
- Fully multi-coated lens for increased light transmission and reduced glare.
Pros:
- Affordable price.
- Top-loading battery compartment.
- Crisp, clear dot.
Cons:
- Requires an adapter plate for the X5 Legion.
- Slightly shorter battery life compared to premium models.
My Experience: I’ve used the Venom on a variety of handguns, and it’s been a solid performer. It’s lightweight and easy to adjust, though the need for an adapter plate was a minor inconvenience.
Customer Comments: Vortex Venom users love the value for money and report that the optic holds zero well after heavy use.
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5. Sig Sauer Romeo 1 Pro
The Sig Sauer Romeo 1 Pro is designed to pair perfectly with the X5 Legion, offering an impressive blend of features, durability, and value. Sig Sauer ensures seamless integration with their firearms, and the Romeo 1 Pro fits directly onto the X5 Legion without the need for additional mounting hardware.
Specifications:
- Reticle: 3 MOA
- Weight: 1.5 oz
- Material: Aircraft-grade aluminum
- Battery Life: 20,000 hours
- Mounting: Direct fit for X5 Legion.
Best Features:
- Stealth ID technology reduces visibility of the optic’s profile to help prevent glare.
- Motion Activated Illumination (MOTAC) powers up when it senses motion, conserving battery life.
- The rugged design can withstand harsh recoil and environments.
Pros:
- Seamless mounting on X5 Legion.
- Motion-sensing technology.
- Excellent durability.
Cons:
- Battery life is decent, but not as long as some competitors.
- Heavier than similar red dots.
My Experience: The Romeo 1 Pro feels tailor-made for the X5 Legion. Installation was quick and easy, and I appreciated not needing any additional mounting hardware.
Customer Comments: Sig Sauer fans praise the Romeo 1 Pro for its perfect fit on the X5 Legion, with many reviewers noting its reliability during high-stress competition use.
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6. Burris FastFire III
The Burris FastFire III is another budget-friendly choice that still delivers high performance. Known for its durability and simple controls, it’s a great option for shooters who want an affordable and reliable red dot.
Specifications:
- Reticle: 3 MOA
- Weight: 1.5 oz
- Material: Stainless steel, aluminum, bronze
- Battery Life: 5,000 hours
- Mounting: Requires an adapter plate for X5 Legion.
Best Features:
- Auto-brightness setting adjusts reticle intensity based on ambient light conditions.
- The small, compact design is perfect for lightweight setups.
- Top-loading battery compartment for easy replacement.
Pros:
- Affordable.
- Lightweight and compact.
- Auto-brightness adjustment.
Cons:
- Requires an adapter for mounting on X5 Legion.
- Shorter battery life compared to premium models.
My Experience: The Burris FastFire III is a solid choice for budget-conscious shooters. While it doesn’t have all the bells and whistles of the more expensive models, it performs admirably at the range.
Customer Comments: Users appreciate its simplicity and value for money, though some note that the battery life could be better.
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How to Choose the Best Red Dot Sight for Your X5 Legion
Choosing the right red dot sight for your SIG Sauer P320 X5 Legion depends on a few factors, including your shooting style, budget, and personal preferences. Here are a few tips to help you decide:
- Durability: If you’re into competition shooting, you’ll need a red dot that can handle heavy recoil and long shooting sessions. Look for models made of aircraft-grade aluminum or similarly tough materials.
- Reticle Size: A 3 MOA dot is a versatile choice, offering a balance between quick target acquisition and precision. Smaller dots (2 MOA) are better for long-range accuracy, while larger dots (6 MOA) are faster for close-up shooting.
- Mounting System: Some red dots like the Sig Sauer Romeo 1 Pro mount directly onto the X5 Legion, while others require an adapter plate. Consider how much work you’re willing to put into mounting the optic.
- Battery Life: Longer battery life is always a plus, especially if you’re using the optic for extended periods. Red dots with motion-sensing technology can help conserve battery life.
FAQs
Q: Do I need to use an adapter plate to mount a red dot sight on the X5 Legion?
A: It depends on the model. Some red dots, like the Sig Sauer Romeo 1 Pro and Trijicon RMR Type 2, can mount directly onto the X5 Legion without an adapter plate. Others, like the Holosun 507C X2 and Burris FastFire III, require a mounting plate.
Q: What’s the best reticle size for competition shooting?
A: For most competition shooters, a 3 MOA dot is a solid all-around choice. It provides good precision without sacrificing speed for close targets.
Q: How often should I replace the battery on my red dot sight?
A: It depends on the model and how often you use the optic. Red dots with motion-sensing technology tend to have longer battery life, with some lasting up to 50,000 hours. Check your optic’s manual for specific recommendations.
In conclusion, pairing your SIG Sauer P320 X5 Legion with the right red dot sight can make a significant difference in your shooting performance. Whether you opt for the battle-tested Trijicon RMR Type 2 or the versatile Holosun 507C X2, you’ll find that each of these red dots brings something unique to the table.