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Vortex Venom Red Dot instruction manual

The Venom Red Dot combines speed and simplicity in a tiny, powerful package. The 3 MOA dot diameter gets you on target quickly and precisely.

Vortex Venom Red Dot
Vortex Venom Red Dot Components
Vortex Venom Red Dot Sight
Vortex Venom Red Dot
  • Anti-reflective lens coating on lens surface for brighter views
  • ArmorTek protects exterior lens from scratches, oil, and dirt
  • O-ring sealed for waterproof performance
  • Shockproof construction withstands impact

Protective Cover

Remove cover when using or adjusting Venom red dot. Please note that installing the cover will shut the Venom off when in Auto Brightness mode, but it will not shut down in Manual Brightness mode.

Vortex Venom Red Dot
Vortex Venom Red Dot


To install or replace the battery, remove the battery cover by rotating it counter-clockwise. Place the battery in the circular slot with numbers facing outward. Replace the battery cover and tighten until snug. Do not over tighten.


Vortex Venom Red Dot
Vortex Venom Red Dot

Powering Up

To turn the Venom on, press either the up or down arrow. To turn off, press and hold the down arrow for five seconds.

Vortex Venom Red Dot
Vortex Venom Red Dot

Power On: Press the up or down arrow.

Power Off: Press and hold the down arrow.

Brightness Adjustments

The Venom red dot has two brightness modes, Auto and Manual. Auto mode will increase or decrease in brightness depending on the ambient lighting conditions. In complete dark, it will shut down and re-power when exposed to light. Manual mode is controlled by the up/down buttons and will not shut off.

  • To engage Auto mode, press and hold up arrow until the dot flashes three times.
  • To engage Manual mode, press and hold up arrow until the dot flashes two times.

Windage and Elevation Adjustment

The Venom features adjustable elevation and windage dials with 1 MOA clicks.

Vortex Venom Red Dot
Vortex Venom Red Dot

To adjust the elevation and windage settings, turn the dials up or down or left or right as indicated by the arrows.


Included Picatinny Rail Mount

Looking for picatinny rail mount suitable for Vortex Venom?

Docter Sight Mounting Platform

Vortex Venom Red Dot
Vortex Venom Red Dot

The Venom red dot is shipped from the factory with a low rail mount that clamps to a Picatinny spec base rail.
Note: If your firearm is not already equipped with a Picatinny base rail, this type of base may be purchased from many firearms dealers.

  1. Attach the low rail mount to the Viper using the included screws.
  2. Attach the Venom to the Picatinny base rail, making sure the recoil lug is solidly seated in the base groove.
  3. Check to see that the clamp is fully down and hooked around the outside of the base.
  4. Press the Venom down and forward toward the muzzle and firmly tighten base clamp screw using large coin or flat blade screwdriver.

Missing proper tools?

Mounting tools

Mounting Options

In addition to the supplied low rail mount, an optional riser mount places the Venom red dot at correct height for AR-15 rifles.

Read our article about Vortex Venom’s footprint

Vortex Venom Red Dot
Vortex Venom Red Dot

Sighting In

After mounting, an initial sight-in of the Venom red dot at 25 yards will be helpful. Final sight-in should be done at the desired distance (typically 25-50 yards). Using the center of the three-shot group as a reference, make the necessary adjustments for windage and elevation correction. Using arrows for reference, adjust dials in the direction you wish the group to move. At 25 yards, each click will yield about ¼ inch of adjustment. Fire a three-shot group at final preferred sight-in distance (25-50 yards).

Using the center of the three-shot group as a reference, make necessary adjustments for windage and elevation correction. Using arrows for reference, adjust dials in the direction you wish the group to move. At 50 yards, each click will yield about ½ inch of adjustment. Fire a final three-shot group to confirm proper adjustment. Repeat as necessary.



The Venom red dot will require very little routine maintenance other than periodically cleaning the exterior lenses. If desired, the exterior lens may be cleaned by wiping with a soft, dry cloth. When cleaning the lenses, be sure to use products that are specifically designed for use on coated optical lenses such as the Vortex Lens Pen and FogFree Cleaning Kits.

  • Be sure to blow away any dust or grit on the lens prior to wiping the surface.
  • Using your breath, or a very small amount of water or pure alcohol can help remove stubborn things like dried water spots.

In need of good cleaning tools?

Cleaning Solutions


If the red dot does not illuminate, please check the following before returning the red dot for service:

  • Is the battery oriented correctly? Be sure the battery is installed with the + side facing upwards.
  • Is the battery dead? If so, replace the battery.

VIP Warranty

We build optics based on our commitment to your absolute satisfaction. That’s why Vortex products are unconditionally guaranteed and we make this Very Important Promise to you—a Very Important Person. Rest assured that in the event your optic becomes damaged or defective, Vortex Optics will repair or replace it at no charge to you. If we cannot repair your riflescope, we will replace it with a riflescope in perfect working order and in equal or better physical condition. Call Vortex Optics at 800-426-0048 for prompt, professional, and friendly service.

Vortex Optics
120 West Greenview Drive
Middleton, WI 53562
[email protected]

Note: The VIP Warranty does not cover loss, theft, deliberate damage, or cosmetic damage that does not hinder the performance of the product.

This text is a transcription of the file in PDF format.




  • I have the Vortex Venom 3 MOA. Is is possible to get the wind age and elevation screws replaced. I need both screws, I have started to strip the screws due to adjustments. Also the battery cover screw is starting to strip. Could I get a new battery cover.

  • Hello , I have a vortex venom on a marlin .357 / 38 special . It is shooting 6 inches low and I have adjusted it up all the way possible. Is there any adjustment to be made to raise the point of impact so I can zero the rifle correctly. Thanks in advance

    • I’m having the same issue with a 10mm s&w pistol. 2 inches low at 25. No more up adjustment.

    • Here is an official response from Vortex taken from one of the other blogs that addresses a similar problem:

      There could be a few factors at play. To confirm, we recommend only 12 inch/lbs with Loc-Tite or 15 inch/lbs dry of torque to secure the red dot to the mounting base. If over torqued it can affect the internal components, which would potentially limit your travel and ability to sight in your optic.

      To ensure the optic is functioning as it should I would recommend running the optic’s windage adjustment all the way to the left and then the right. I would do the same with the elevation to ensure there is not a burr on the internals affecting your ability to dial your elevation adjustment higher. The optic has 130 MOA of total travel, so run the elevation first 65 MOA from either direction to get it close to the optical center. For the windage, it has 100 MOA, so 50 from either direction would get you back to the center. This also helps to confirm you’re getting the full travel of the optic. You should have slightly over 4 rotations of the elevation and just over 3 for the windage dials.

      If that does not work, it is likely a situation where you have ran out of elevation adjustment based on the unique alignment of your firearm. This can happen due to machining tolerances on a wide variety of firearms, so it is not uncommon. I personally had a similar situation with a Mossberg 835 and our Venom Red Dot I use for turkey hunting. In a perfect world, every firearm would be square, but that is never the case. You could have two of the same exact firearms a serial number apart off the production line and they will zero with the same exact make/model red dot different. This is why optics have gross windage and elevation adjustments to accommodate the firearm, but some may need more adjustment.

      The final solution would be to acquire a 1 degree shim from UM Tactical.. This shim would sit between your optic and the base. It would operate in the the same fashion as a long range shooter utilize a 20 MOA picatinny rail to gain elevation adjustment. This shim would give you approximately 60 MOA of elevation adjustment, which would instantly raise your POI roughly 15 inches at 25 yards, 30 inches at 50 yards getting you back on target.

      Hope that this is helpful.

  • I was impressed with vortex. They really stand by their warranty. I emailed vortex to let them know that I lost my battery cover on my venom red dot .
    Within 24 hour they responded and in days I received a new battery cover part of their warranty.
    Great customer service

    Thanks vortex

  • I mounted my vortex venom on my ATI 12 ga over and under ventilated rib . I put a weaver scope base on the ventilated rib then mounted the venom to it . The red dot did not coincide with the proper height required to center the rectical so I got a riser mount 1/2” high and mounted it under the venom sight . It then aligned properly giving me plenty of adjustment area to line up the red dot on the 50 yard target . The venom vortex sight works perfectly and maintains its setting .I use the gun at turkey shoots and also for hunting geese . I have a red dot on all my pistols and shotguns .

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