Redfield Accelerator and the Glock 40


When I received the GLOCK 40 MOS 10mm Auto test sample, I wanted an inexpensive sight to test the MOS, Modular Optic System, set up. You can read the review of the Glock 40 MOS by following this link .

Looking around, I found the Redfield Accelerator at a deal and I was pretty excited to get the sight mounted on the GLOCK test pistol. When I began to try to mount the sight I could not make it work. The actual sight should mount directly to one of the four supplied mounting plates from GLOCK. However, the Redfield does ship with a plastic mounting plate. When I Incorporated this supplied plate to MOS plate five from Glock they meshed together. Unfortunately the Redfield plate is too long to fit into the cut out on the GLOCK slide. Also, none of the supplied threaded fasteners were long enough to go through the sight, both plates, and fasten to the predrilled holes in the GLOCK slide.


Using the GLOCK plate as a jig, you can cut off just a small part of the rear of the Redfield plate allowing it to be even with the GLOCK plate and it will fit into the slide.

The left plate is from the Redfield Accelerator after it was cut down to match the GLOCK MOS plate, as you see it in the center. On the far right it is Redfield Accelerator plate. If you will notice it is quite a bit longer than the GLOCK MOS plate and that is exactly what kept the sight from mounting. Cutting the Redfield plate down did not affect mounting or any other function. I have no idea why the Redfield is not compatible with any of the MOS plates or why the plate is the length it is, unless it is to keep from mounting the Redfield Accelerator on the GLOCK as to push people into buying the more expensive red dot sight.  I hope that is not true but I have my suspensions.


A trip to the hardware store I was able to locate threaded fasteners that were long enough to mount the Redfield Accelerator to the GLOCK 40, using the Redfield’s supplied plate to mount to the GLOCK number five plate. These were a bit long so it took a little fitting to get them to work.


This set up works and has proven secure but you are not able to cowitness the GLOCK factory sights using the optic.


It does get the Redfield high enough to easily adjust elevation at the rear of the sight with the supplied tool.


All in all the Redfield Accelerator proved to be a good sight when mounted on the GLOCK 40 and the Double D Armory SST AR-15 , reviewed here,  I did not have any issues with it loosing zero, but as with any optic, if you remove it then it will have to be tweaked a bit and zero should always be verified before a match or other important shoot.


You can see the ON/OFF button here, toggling it decreases the intensity from high, to medium, and low of the red dot and then shutting it down. It also has an auto off switch as to save the single CR 2032 battery. The battery compartment is located on the top of the optic body, just in front of the windage adjustment.  Also included is a cross-slot mount for Picatinny/Weaver-style rails/mounts and a plastic protective cover. The sight can also be mounted by drifting out the rear sight and using an adapter to mount it in the slides’ dovetail. I believe this is a very bad idea, if your optic were to go down, you would be without a rear sight or optic. By keeping the rear sight on and mounting as I have figured out, if your optic were to go down you could remove the sight and still have your iron sights.

By Hunter Elliott

I spent much of my youth involved with firearms and felt the call early on to the United States Marine Corps, following in my father's and his brother's footsteps. Just after high school I enlisted and felt most at home on the rifle range, where I qualified expert with several firearms and spent some time as a rifle coach to my fellow Marines. After being honorably discharged I continued teaching firearm safety, rifle and pistol marksmanship, and began teaching metallic cartridge reloading. In the late 1990s I became a life member to the National Rifle Association and worked with the Friends of the NRA. Around that time my father and I became involved with IDPA and competed together up until he passed away. I began reviewing firearms for publications in the mid 2000s and have been fortunate to make many friends in the industry. Continuing to improve my firearms skills and knowledge is a never ending journey in which we should all be committed. I am also credited as weapons master on a few independent films.

10 thoughts on “Redfield Accelerator and the GLOCK 40 MOS”
    1. .535″ but they were just a cat hair long so I had to take a few thousands off. Initially they forced the MOS plate up just a bit. Once I got the threaded fasteners shortened they worked perfect.

    1. The plates for the Glock 40 are numbered different than the other Glock MOS plates, though they the same pattern the Glock 40 plates are wider to accommodate the wider Glock slide.

  1. Thanks for this write up, I was able to mount the redfield to a glock 19 MOS, using plate number 1. I lined plate 1 with the redfield plastic plate, marked the line with a razor blade and cut the excess in the front to match with a hacksaw. Worked like a charm. Now all I have left to do is source those longer screws.

    On another note, would you know which surpressor sights I need to get for the dot to cowitness?

    1. I am glad that worked out for you. It is a bit of work but worth it so the sight will work. I have not tried any silencer sights so that I honestly cannot say for sure.

  2. Hunter, still here?
    I have need of a Glock model 40 MOS plate that incorporates a short section of Pictinny or Weaver style rail. With the cross bolt notch, of course.

    I think you said such was available from Redfield?
    In their “Accelerator Package” I believe?

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