Vortex 4 M.O.A StrikeFire II Red Dot Sight SF-RG-501


VORTEX 4 MOA StrikeFire II Red Dot Sight (SF-RG-501)

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  • VORTEX 4 MOA StrikeFire II Red Dot Sight (SF-RG-501)
  • VORTEX 4 MOA StrikeFire II Red Dot Sight (SF-RG-501)
  • VORTEX 4 MOA StrikeFire II Red Dot Sight (SF-RG-501)
  • VORTEX 4 MOA StrikeFire II Red Dot Sight (SF-RG-501)
  • VORTEX 4 MOA StrikeFire II Red Dot Sight (SF-RG-501)

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  • Fully multi-coated with anti-reflective lens coatings for brighter views
  • Nitrogen gas purging with o-ring seals delivers fogproof, waterproof performance
  • Shockproof construction withstands recoil and impact
  • Rugged, one-piece aluminum alloy chassis
  • Hard-anodized black matte finish
  • Unlimited eye relief for rapid target acquisition
  • Lower 1/3 co-witness cantilever mount or low ring mount option

When situations demand split-second target acquisition and maximum field of view, mount up the StrikeFire II and shoot - both eyes open.

Feature-rich, versatile and reliable, the StrikeFire II is a great choice for shooters who want a quality red dot sight, but don't want to break the bank.

Features sleek rear-facing controls for power on/off and easy adjustment of ten dot intensity levels - lowest two settings are night-vision compatible.

Automatically returns to the last dot intensity used when powered up. The 30mm aluminum alloy chassis provides extra-high recoil rating and is waterproof and fogproof. Strike fast!


The lower 1/3 co-witness cantilever mount model is ideal for platforms, positioning the optic bore center 40 mm above the base surface.


Magnification: 1 x

Objective Lens Diameter: 30 mm

Eye Relief: Unlimited

Adjustment Graduation: 1/2 MOA

Travel per Rotation: 25 MOA

Max Elevation Adjustment: 100 MOA

Max Windage Adjustment: 100 MOA

Parallax Setting: Parallax Free

Length: 5.6 inches

Weight: 7.2 ounces


Fully Multi-Coated: Multiple anti-reflective coatings on all air-to-glass surfaces increase light transmission.

Red/Green Dot: Allows shooters a choice of dot color.

Brightness Settings: 10 Levels

Parallax Free: All red dot and holographic sights will exhibit some small amount of parallax. Matching current industry practice, this small amount would be considered 'parallax free' and will make a negligible difference in the StrikeFire II's performance.


Single-Piece Chassis: Compact and lightweight.

Waterproof: O-ring seals prevent moisture, dust and debris from penetrating for reliable performance in all environments.

Fogproof: Nitrogen gas purging delivers fogproof, waterproof performance.

Shockproof: Rugged construction withstands recoil and impact.

Hard Anodized Finish: Highly durable low-glare matte finish.

Operating Temperature: Rated from -22 degrees to +140 degrees Fahrenheit.


Cantilever Ring Mount: Puts the optic bore center 40 mm above the base, providing lower 1/3 co-witness with iron sights on flat top rifles.

Unlimited Eye Relief: Non-critical eye relief for rapid target acquisition.

Adjustable Dot Intensity: Provides ten variable illumination settings—the lowest two settings are night-vision compatible.

Battery Life: 12-hour auto-shutdown feature maximizes battery life. Typical battery life is 300 hours at maximum brightness and 6,000 hours at minimum brightness setting.

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  Magnification     1x  
  Objective Lens Diameter, mm     30  
  Eye Relief     Unlimited  
  Adjustment Graduation, MOA     1/2  
  Travel per Rotation, MOA     25  
  Max Elevation Adjustment, MOA     100  
  Max Windage Adjustment, MOA     100  
  Parallax Setting     Parallax Free  
  Reticle     4 MOA Red/Green Dot  
  Length, in     5.6"  
  Weight, oz     7.2  
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1 Review

  • 5
    VORTEX 4 MOA StrikeFire II Red Dot Sight (SF-RG-501)

    Posted by Trusted customer on Nov 25th 2017

    Purchased this red dot to mount on one of my backup rifles. Not being made of money, I can't really afford to put an Aimpoint/EOTech/Trijicon on every AR I own, so this seemed like a decent option. After putting around 500 rounds through the optic I have to say I'm impressed! You get a l it more optic than the price would suggest. I like the 30mm tube as it seems to give you a better field of view and the included Cantilever mount is a pretty good option. The side mounted control buttons are easy to access and use, but they can feel a little soft. Plenty of brightness levels for low-light to bright daylight. One of my biggest complaints is the 4 MOA dot. At 150 yards and in it's fine, especially considering this isn't designed as a precision optic. However, at longer distances the dot obscures more and more of the target, making accurate shot placement increasingly difficult. For example, the dot covers 4 inches at 100 yards, 8 inches at 200 yards, 12 inches at 300 yards, etc. You can quickly see that anything less than a 12 inch target at 300 yards would be challenging to get good hits on. Other red dot sights utilize a 2 MOA dot and that would be much better on this optic. But, for less than $200 you can't really complain! Overall a great optic with a low price and mid-grade quality and features!

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Additional Information

StrikeFire II
Objective Size:
Product Type:
Red Dot Sights
Reticle Size:
Serialized Item:
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