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Customer Reviews
Helpful Positive Review
507 Comp Killer by Codemaster, Verified Owner, July 18, 2025
New to USPSA, I started with an 1MOA SRO on my tactical Glock 17 and was quickly looking for a bigger reticle. I hated the Holosun 507 Comp due to the thick square bezel and tiny dot or circle dot combos. For someone with astigmatism, circle dots are...
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3/3 found this helpful
Helpful Positive Review
Pleasantly surprised by Heggie, Verified Owner, February 22, 2025
I was recommended this brand as being a decent budget optic and I wanted something to put on my Desert Eagle, so I ordered it. It works. It’s got a big, visible dot and the brightness settings allow for easy daytime shooting in the Florida sun. If yo...
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1/1 found this helpful
Most Recent Reviews
broke after a year, horrible Gideon CS by EEB, Verified Owner, June 1, 2026
Bought it in may 23 2025, exactly a year later, while shooting a match, the dot started going on and off under recoil, then completely quit on me. replaced the battery, no luck, made sure everything is nice and tight, still not working. I emailed Gid...
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Most Recent Reviews
I have 500 rounds with this mounted on my G47 and very happy with it. Like the direct mount and big window. Holding zero so far. I am just not sure if I am a fan of green dots or the large MOA dot( just a preference thing not an issue with the mercha...
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Most Recent Reviews
Don't fear the 8 MOA by tomb, Verified Owner, October 28, 2025
Was a little worried the 8 MOA dot would be too big, but I really like it more than 3. Went with this cause all the other MOS cut dots sit really low and wanted this so the dot would be over the suppressor. It is the perfect height for suppressor. Gl...
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Most Recent Reviews
Great Red dot foe the Glock 41 by Mel, Verified Owner, October 23, 2025
Purchased this optic for a recently purchased Glock 41 MOS in 45ACP. My first ever Glock and first ever large bore pistol I've put an optic on. Really easy to mount directly to the slide. Optic comes with an additional Picatinny mount, and you simply...
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Read All 7 Reviews

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Product Info for Gideon Optics Granite MOS Competition 1x 28.33x22.5mm Reflex Red Dot Sight

Gideon Optics engineered the Granite MOS Comp from feedback from elite shooting sports participants who needed a competition sight that helped them score better. The Granite Comp has our largest lens and a big 8 MOA bright dot for faster target acquisition balanced with the accuracy and precision to deliver small groups. Packed with the features you need to make every shot count, this practical red dot is a cost-effective way to upgrade your competition gun and explore your sport on a whole new level.image

The Granite MOS Comp is built to install easily, provide a long service life, and deliver superior speed and accuracy at the firing line. Bring Gideon Optics performance and quality to your next scorecard.

WARNING: California`s Proposition 65

Specifications for Gideon Optics Granite MOS Competition 1x 28.33x22.5mm Reflex Red Dot Sight:

Manufacturer: Gideon Optics
Color: Black
Fabric/Material: Aircraft Grade Aluminum
Magnification: 1 x
Objective Window Size: 28.33x22.5 mm
Reticle: 8 MOA Dot
Illumination Type: LED
Brightness Settings: 10
Adjustment Click Value: 1 MOA
Battery Type: CR2032, Lithium Metal
Water Resistance Level: Waterproof
Shockproof: Yes
Weight: 1.97 oz
Condition: New
Red Dot Sights-Footprint: Glock MOS
Lens Type: Glass
Dimensions: 50.5x38.5x32.9 mm

Features of Gideon Optics Granite MOS Competition 1x 28.33x22.5mm Reflex Red Dot Sight

  • The large 28.33 mm wide x 22.5 mm tall lens is housed in a strong, lightweight aircraft-grade aluminum housing and features an 8 MOA red or green aiming dot.
  • Adjustable wind and elevation lets you fine-tune your aim up to 45 MOA each at 1 MOA per click.
  • Choose from ten brightness levels, including two night-vision compatible settings.
  • Compatible with any slide or adapter plate with an MOS footprint. You should use the same screws that attach the Granite to the pic mount for mounting to the MOS slide. A set of long M3.0 and M3.5 screws are also included and may be useful for alternate applications.
  • The Granite is Parallax-free to 33 yards, after which ensuring you keep your reticle in the middle ⅔ of the lens will still provide championship accuracy.
  • Motion-sensing technology powers down your optic after 255 seconds without movement to conserve your battery’s life, then brings it back in milliseconds with a quick shake.
  • The Granite is powered by a 3V CR-2032 button cell battery in a quick-change compartment that doesn’t require reinstallation or re-zeroing of the sight after battery changes.
  • Measures 50.5mm x 38.5mm x 32.9mm with a deck height of 8.4mm and with the battery installed to keep added bulk and weight low.
  • Your optic is protected by Gideon’s lifetime warranty. If your sight fails for any reason short of physical damage or abuse, we’ll make it right.

Package Contents:

  • Gideon Optics Granite MOS Competition 1x 28.33x22.5mm Reflex Red Dot Sight
  • Picatinny mounting plate/adapter
  • A set of long M3.0 and M3.5 screws

Gideon Optics Granite MOS Competition 1x 28.33x22.5mm Reflex Red Dot Sight Orderable Models

List of Orderable Models

  • Gideon Optics Granite MOS Competition 1x 28.33x22.5mm Reflex Red Dot Sight, 8 MOA Green Dot Reticle, Black, GTMOS-CO-GN , MPN: GTMOS-CO-GN , UPC: 721750144423 , Code: 5N2-RD-GI78MOS-GTMOS-CO-GN
  • Gideon Optics Granite MOS Competition 1x Reflex Red Dot Sight, 8 MOA Red Dot, Black, GTMOS-CO-RD , MPN: GTMOS-CO-RD , UPC: 721750136435 , Code: 5N2-RD-GI78MOS-GTMOS-CO-RD

Gideon Optics Granite MOS Competition 1x 28.33x22.5mm Reflex Red Dot Sight Unavailable & Discontinued Models

List of Unorderable Models

  • USED, Gideon Optics Granite MOS Competition 1x Reflex Red Dot Sight, 8 MOA Red Dot, Black, GTMOS-CO-RD , MPN: GTMOS-CO-RD-EDEMO , Code: 5N2-RD-GI78MOS-GTMOS-CO-RD-EDEMO-IN-B
  • DEMO, Gideon Optics Granite MOS Competition 1x 28.33x22.5mm Reflex Red Dot Sight, 8 MOA Green Dot Reticle, Black, GTMOS-CO-GN , MPN: GTMOS-CO-GN-DEMO , Code: 5N2-RD-GI78MOS-GTMOS-CO-GN-DEMO
  • DEMO, Gideon Optics Granite MOS Competition 1x 28.33x22.5mm Reflex Red Dot Sight, 8 MOA Green Dot Reticle, Black, GTMOS-CO-GN , MPN: GTMOS-CO-GN-DEMO , Code: 5N2-RD-GI78MOS-GTMOS-CO-GN-DEMO-OB-A
  • DEMO, Gideon Optics Granite MOS Competition 1x Reflex Red Dot Sight, 8 MOA Red Dot, Black, GTMOS-CO-RD , MPN: GTMOS-CO-RD-DEMO , Code: 5N2-RD-GI78MOS-GTMOS-CO-RD-DEMO
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Last updated 2026-07-02 UTC.