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Glock Rear Sight

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Product Description

The 10-8 Performance rear sight is precision CNC machined from heat treated 4140 bar stock and finished in black QPQ salt bath nitrocarburizing (aka Melonite, same as the Glock slide). All 10-8 sights feature a U notch for rapid, intuitive alignment with dot such as on our tritium insert, brass bead, and fiber optic front sights. The rear face is plain black, serrated at 40 lpi to reduce glare in varied lighting conditions.  

  • Fits: MOST Glock models, all calibers, all frame sizes, all slide sizes.  
    • most Glock models, including large frame 20/21 most commonly use the .215" front.  
    • Glock 34/35, 41, 17L, 24L most commonly uses the .235" front.  Sights do not overhang slide cutout.
    • Glock 42/43 use our model specific front/rear sights.
    • Glock MOS slides use the universal Glock rear dovetail, but located more to the rear. These sights are not compatible with the MOS slide.
  • Notch widths: .140" and .156" U Notch
    • .140" - good balance of speed and accuracy
    • .156" - good for maximum speed, preferred for older eyes 
  • Compatible with .215" - .250" tall front sights (see below for more info)
    • Our rear sight is .250” net blade height above the slide
    • Use a notch width equal to or greater than front sight width.
    • NOT compatible in elevation with the Glock OEM, Trijicon OEM style, TruDot, Meprolight, TruGlo TFO front sights as they are too low.
    • XS Standard Dot front sights are .200" tall.  Our .156" notch rear is recommended, but we do not guarantee POA/POI due to the short height.
    • XS Big Dot front sight is .195" wide, and is too wide to work with any our sights.
    • Trijicon HD, GL101 Series front sight is .215" tall x .144" wide.  Our .156" notch rear is compatible.

User installation instructions included. Fitting is usually not required, but the QPQ/Melonite finish is harder than a normal steel file. It needs to be filed with a diamond file or hone (see Brownells.com), as files will slide right off the surface.

Please contact us for a discounted price on additional front sights if your initial purchase does not provide the desired point of impact.


Read our article about selecting sights.

Product Videos

Glock Sight Install (04:24)
10-8 Performance Glock Sight Installation
  • Glock Sight In...
    10-8 Performance Glock Sight Installation
  • Fiber Optic In...

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Product Reviews

Showing reviews 1-10 of 71 | Next

  1. Great sites and easy to pick up fast. 5 Star Review

    Posted by on 20th May 2016

    Great sites and way less busy than the three dot set ups.

  2. 309Tactical supports 10-8! 5 Star Review

    Posted by on 9th Jan 2016

    Another sight for the shop.

  3. Great rear sight for CCW 5 Star Review

    Posted by on 15th Dec 2015

    Edges aren't sharp like Trijicon's. Wont dig into your skin. Great sight acquisition.

  4. Glock Rear Sight - .156 Width - A Sight for Sore Eyes 5 Star Review

    Posted by on 26th Oct 2015

    Having spent 30+ years in federal law enforcement and the military, I can appreciate a set of sights that are quick to acquire with acceptable combat accuracy. Now that I am retired, ailing eyes are even more demanding of a bit more air around the front sight post. Combined with a standard width front, the .156 rear sight offers extremely fast sight acquisition from the holster. I have this rear set up on a Glock 21 with a brass bead front and on a Glock 20 with a fiber optic front. Both work well for me for SD and recreational use. The rear sight was easy to install with only a couple of swipes with an emery cloth required. I find this a reasonable alternative to special purpose glasses that I would not use for everyday or attaching a red dot sight system, both of which tend to be expensive and less practical for my needs. YMMV

  5. Glock Rear Sight -- .140 Width -- Simply Outstanding 5 Star Review

    Posted by on 21st Sep 2015

    Purchased this rear sight for a Glock 21, Gen 4. Selected the .140 rear sight opening and coupled it with a .215 height/.125 width tritium 10-8 front sight. Installation of the rear sight was easy, very minor fitting that only required a few strokes with a triangle file. Probably would have gone in fine without any fitting at all. Results were fantastic -- point of aim = point of impact at 7 yards and 25 yards with 230gr ball ammunition.

    FWIW, I have run 10-8 .156 notch rear sights with .125 width front sights on full-sized guns and find the .156 is harder for ME to align the sights with when looking for the precision shot ... but it does provide great speed. I am 40+ years old and some reading glasses are in my near future but still find the .156 too wide of an opening for my personal taste on a full-size gun. However, I also run a .156 rear sight with a .125 width front sight on a Glock 26 and find it to be a very good set-up ... the difference being the shorter sight radius (vs. a Glock 21) which causes the front sight to take up more visual space in the rear notch on a Glock 26.

    Overall, the .140 rear sight, .215 height/.125 width front sight combination provides ME outstanding accuracy and good speed for front sight pick-up and sight alignment on the Glock 21.

    Of course, your mileage may vary.

  6. Outstanding 5 Star Review

    Posted by on 30th Jul 2015

    This is my go to rear sight. I have a 10-8 rear sight on every pistol I own for which they are available. I know of no better statement about how much I like this sight. It offers me a great sight picture when I combine it with either a front night sight or gold dot front sight. My last one was purchased for my SIRT pistol just to train with the same sight picture.

  7. Glad I chose 10-8 5 Star Review

    Posted by on 18th Jun 2015

    I was on the fence with Trijicon HDs and 10-8s for my g17. I recently tried the HDs on a buddy's g19 and I'm glad I chose 10-8. I went with the .140 rear notch width/.115 front width and its the perfect blend of speed and precision for me.

  8. Best rear sight ever! All business and nothing else. 5 Star Review

    Posted by on 15th Jun 2015

    I ordered the .140 rear for my G17 and paired it with the 10-8 tritium front. I have never had a more accurate and crisp sight picture than 10-8's. The .140 with the .125 tritium front is a great balance of speed and accuracy. These are my third sets of 10-8's and I have noticed that the quality on each set are perfectly consistent. There are no deformities in the sight picture whatsoever. They're simple, rugged, and to the point. Go 10-8.

  9. best rear sight available 5 Star Review

    Posted by on 29th May 2015

    The u notch makes for a super fast sight acquisition and the cleanest sight picture available. A round fo front fits so naturally in a u notched rear it just performs flawlessly

  10. best rear sight for glock on the market 5 Star Review

    Posted by on 26th May 2015

    Rear sight is awesome. The .156 notch is perfect for quick sight acquisition. I paired it with a .125 wide front fiber optic (next time I might opt for the .115 wide). Perfect fit - no filing required at least with my gen 4 g19. Easy to install. The ledge is perfect for one handed manipulation drills.

Showing reviews 1-10 of 71 | Next

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