How to Mount a Scope on AR-15 with Front Sight: Complete Guide

As all of you know already, AR15 is one of the best and the most desirable rifles you can have. It does come with a fixed front sight that is a masterpiece. It is accurate, strong, and durable. But, what if you want to learn how to mount a scope on AR-15 with front sight? First of all, you can do it. The process is a bit complicated but we will guide you through it and reveal all the steps and all the things you need.

How to mount a scope on AR-15 with front sight: Step by step guide

It is worth noting that installing a scope or red dot for ar15 that already has a front sight is possible. Keep in mind that you will see the sight through your scope when using low magnification scope. On higher magnifications, the sight won’t be visible. For some, this can be an issue while for others it is far from that.

AR-15 front sight

The best combination can be a foldable or adjustable front sight for your AR15[1] Thanks to this, you can easily remove it or fold it when not in use. You can also remove the front sight completely which is a complicated process. When it comes to learning how to install a scope on a rifle, some owners simply cut the front sight. This isn’t something we want to recommend. Replacing the factory sight with the aforementioned options is the best outcome if the front sight annoys you when using the scope. Anyway, follow these steps when installing the scope.

  1. Unload the weapon! Remove the magazine and use rubbing alcohol to clean the rail and the screws. Take your time for this step.
  2. Place the rifle in a vice or in some holder to make sure it doesn’t move while installing the scope.
  3. Install the scope mount and use your hands to tighten down the screws. Use a torque wrench to tighten down the screws according to factory specifications. Do not place the scope mount on the upper receiver or on the free-floating rail.
  4. Place the scope on the scope mount and use upper rings to secure it in place.
  5. Use a bubble level to level the scope. This is a separate process. Make sure the scope is aligned vertically and horizontally. You can shoot and test the scope and adjust it accordingly.
  6. If you want to use your rifle for 600+ yards targets, lap the rings. This means you will need to sand down the inner portion of the 34mm Scope Rings to make the best possible surface-to-surface contact.


This is a complete guide and there are no additional steps. You need to make sure that your Quick Disconnect Scope Mounts and the scope are compatible with the AR15 and that the scope is properly leveled. Take your time and try to level up the scope as accurately as you can. This will have a huge, positive effect on your accuracy. In addition, adjusting the scope is a separate matter and you may want it to be done by a professional. If you don’t have the time, this is a worthy option. You can buy the best Scopes for AR-15 with Fixed Front Sight, but if you don’t calibrate it correctly you’ll run into accuracy issues.

How to choose the right scope for AR15?

The most important thing, in this case, is to choose a scope that will meet your requirements. Here are a few factors you need to consider. Yes, a more expensive scope will be a better maid and will have more features. It should be more accurate as well. However, there are additional things to consider.


Magnification is usually the main factor to consider[2] It defines how many times the scope will magnify the target. For example, 4X scope will make the target 4 times enlarger. More appealing models have an adjustable magnification that looks something like 4-10. This means that you can choose any magnification between 4 and 10 times. Depending on your AR 15 setup and how powerful your scope is, shooters can shoot from long distances.

A scope of 4x magnification is useful for a distance of up to 300 yards. The one with 6x magnification can be ideal for targets up to 400 yards. A scope with 10x magnification is perfect for 250-1000 yards distance. Keep in mind that the last model isn’t suitable for targets under 250 yards. Choose according to your needs.


A larger diameter of the scope means more light can penetrate the scope and provide a clear image. But, it also means you will use a heavier weapon. Weight has a huge impact. You will hold your AR15 for hours so a lower weight is an advantage. Smaller scopes are ideal for closer targets while a bigger diameter is suitable for long-distance shots.

Coating of the lenses

Coating of the lenses decreases glare and improves the image. There are 4 types of coatings:

  1. Coated – When lenses are described as coated, a single layer of coat is applied to just one surface. Unsurprisingly, this is normally the most affordable option.
  2. Fully Coated – When lenses are fully coated, a one-layer of coat will be applied to all of the lens surfaces.
  3. Multi-Coated – Several layers of coat are applied to one surface.
  4. Fully and Multi-Coated – This is the best option, but it also comes with a heftier price tag. Fully and Multi-Coated lenses have several layers on all of the surfaces.


A reticle is a crosshair that you will see when using the scope. You can get a duplex, which is a crosshair pattern and known for simplicity. A popular option for hunters and enthusiasts alike, the duplex finds its way onto many scopes as it is popular for target shooting. Similar to the duplex, a mil-dot also helps you determine the distance of the target. These are used by the military and law enforcement. BDC is used to estimate the drop of a bullet making it perfect for long-distance shootings. Red dots & holographic sights are also popular options.

Frequently Asked Questions

Can you use a scope on an AR-15 with a front sight?

Yes, you can use a scope on an AR-15 with a front sight. The front sight does NOT prevent you from mounting a red dot sight or similar optic to improve your shooting performance.

What is the best scope for AR-15 with front sight post?

The Aimpoint Micro T2 is great scope for an AR-15 with a front sight post. The T2 is a highly durable optic that performs well in just about all shooting conditions.

The final word

If you want to know how to mount a scope on AR-15 with front sight, this framework should guide you down the right path. In reality, it’s not difficult, but it can be time-consuming and will require a few tools. Keep this in mind as you work through the process, and remember, your effort can result in a significant boost in accuracy!

About the author

Patrick Howard

I have been working as a gunsmith for 20 years. Rain, fog, moisture, high temperature, or even snow are all the things a product must withstand in order to be recommended by me.

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