How Far Back To Mount Scope? – Ultimate Guideline

Mounting a scope on a rifle is an important step in ensuring accuracy and stability when shooting. Today, I will discuss how to correctly mount a scope, including how far back the scope should be mounted. Also, I will provide several tips on how to properly mount a scope and other considerations to ensure the best results.


What Is Eye Relief And Why Is It Important?

Eye relief is the distance between the eyepiece and the user’s eye when viewing an image through a telescope, binoculars, or other optical devices.

It is important because it determines how close the user has to be to the device in order to get a clear image.

  • If the eye relief is too short, the user will have to be too close to the device to get a clear image,
  • And if the eye relief is too long, the user may not be able to reach the eyepiece at all.
  • Eye relief also affects the field of view and the amount of detail that can be seen in the image.


So, How Far Back To Mount Scope? How Much is Enough?

The answer depends on the type of scope and the firearm you are using. Generally, the distance you need to mount a scope is determined by the type of scope and the size of the objective lens.

The larger the objective lens, the farther back it must be mounted in order to provide a clear image.

  • Typically, a scope with an objective lens of 32 mm or larger should be mounted at least 3 to 4 inches from the back of the receiver
  • But a smaller objective lens should be mounted about 2 to 3 inches back.

In terms of how much is enough, it really depends on your individual shooting needs and preferences. Some shooters may need more eye relief than others. Thus it’s essential to check the specs of the scope and the firearm to determine the right distance for your particular setup.


What Other Problems Can A Wrong Eye Relief Cause?

Wrong eye relief can cause a variety of problems, including eye strain, headaches, double vision, difficulty focusing, and neck and shoulder pain.

  • It can also cause the eyes to become tired more easily, leading to fatigue and difficulty concentrating.
  • The eye relief can lead to a decrease in overall vision quality, as the eyes are not able to focus properly on the field of view.
  • Additionally, wrong eye relief can cause the eyepiece to be uncomfortable to use, as it may be too close or too far away from the eye.
  • Lastly, it may cause the user to miss out on important details in their field of view, as the user cannot able to focus on them.

What’s The Deal with Unlimited Eye Relief?

Unlimited eye relief is a feature of some scopes and sights. And it allows a shooter to move their eye away from the eyepiece without losing image quality. It also helps the shooter to position their eye in a more comfortable position and gives them more leeway when moving quickly between targets.


A Step-by-Step Guide: Eye Relief Adjustment

  • You can start by making sure the rifle is unloaded, with no magazine and the chamber cleared.
  • Set up a target at a distance of 25 yards.
  • Now place your shooting glasses on and mount the rifle in a comfortable position.
  • Adjust the rifle scope to the highest magnification.
  • Look through the scope and make sure you can see the target clearly.
  • After that, place your head in a comfortable position and make sure your eye is looking through the scope in the center of the eyepiece.
  • Place your finger on the eyepiece and slowly turn it clockwise or counterclockwise.
  • As you turn the eyepiece, you should notice the target becoming blurry and then coming back into focus.
  • When the target is back in focus, stop turning the eyepiece.
  • Keep your head in the same position and look through the scope. If the reticle is slightly blurry, turn the eyepiece slightly in the opposite direction of what you did before.
  • Keep repeating this process until the target is in focus and the reticle is sharp.
  • Now, take a few shots at the target to make sure you are getting an accurate sight picture.
  • If you need to adjust the eye relief further, repeat steps 7-12 until you are satisfied with the sight picture.

And when you are satisfied, you are done!


Generally, How Far To The Front/Back Do You Mount Your Scope?

The scope should be mounted so that it is perfectly aligned with the barrel of the rifle and approximately 1 to 1.5 inches above the top of the rifle’s receiver. It will ensure that the scope is properly aligned when the rifle is shouldered, allowing for proper eye relief.


How to Perfectly Mount a Rifle Scope?

  1. Attach the scope rings to the rifle: If the scope is being mounted on a Picatinny or Weaver rail, then you can attach the scope rings to the rail directly. But if the rifle doesn’t have a rail, then you’ll need to attach the scope rings to a one-piece or two-piece base. Make sure to use the correct screws and properly tighten them.
  2. Install the scope into the rings: Carefully slide the scope into the rings. Make sure to handle the scope gently, and avoid any contact with the lenses. Also, be sure that the scope is seated properly in the rings and that the rings are properly aligned.
  3. Mount the scope to the rifle: Once the scope is in the rings, attach the rings to the rifle. Make sure to tighten the screws securely, but not too tightly.
  4. Check the eye relief: Eye relief is the distance between your eye and the rear lens of the scope. Do not forget to check the eye relief to make sure that you have the correct amount of space between your eye and the scope.
  5. Level the scope: Use a bubble level to make sure that the scope is level with the rifle.
  6. Adjust the reticle: Once the scope is mounted and leveled, you can adjust the reticle to make sure that it’s centered in the field of view.
  7. Test the scope: Now it’s time to test the scope to make sure that it’s properly mounted and that everything is functioning properly.



The correct mounting of your scope depends on your particular firearm, shooting style, and other factors. The best way to determine how far back to mount your scope is to test it out. And make sure to adjust the scope until you find the mounting position that best suits your needs. With a bit of practice and experimentation, you will be able to find the perfect fit.