What Are The Different Sizes Of Scope Mounts?

Mounting a scope on firearms is a recent move, as it has been rare at the beginning of the 20th century. Over time, people saw the advantages of using a scope on their guns since it allows proper magnification for aiming.

Today, almost all rifles use scopes. With this, the knowledge of different sizes of scope mounts will come in handy for new and experienced target shooters alike.

However, you need to know how to find the best AR-10 scope mounts, especially since sizing and accuracy play a significant role in the shooting. For example, having an ill-fitted scope mount can lead to improper posture and disastrous results.

Detailed below are the different ways that scope mounts get sized. After all, it’s based on various factors, such as the scope’s rings, base, and actual size.

Different Sizes, Different Parts

1. Based on Scope Rings

The most common way to determine the right size of the scope mount is to base it on the diameter of the scope’s tube. That said, scope mounts can come in 30mm or 34mm main tube diameters. Other scopes also have one-inch tubes, this being the most common size.

2. Based on the Scope Itself

Another common method shooting enthusiasts use to determine the correct size of their scope mount is basing it on their scope. Don’t forget to check how it fits your gun along with your shooting purposes and preferences.

The objective is to choose one that won’t make your scope too big when mounted. That said, novices can start with sizes between 30mm and 40mm, which is also common for general target shooting and hunting.

3. Based on Scope Ring Heights

Some scope mounts come with rings with increased heights. Hence, you need to determine this when choosing its size as well.

Another factor is the size of the scope ring’s ocular bell. Sizes range from 32mm to 50mm. The rule of thumb is the larger the ocular bell size, the higher the mandatory ring height needed is so that the scope mount is not touching the barrel.

In turn, this secures proper firearm function. Also, bolt action rifles need higher scope mounts for better action. You can also use low or medium-height rings when mounting a scope with a 40mm ocular.

Lastly, don’t forget to distinguish between medium and high heights. Medium rings are usually 28mm, while high ones are 32mm. This helps ensure proper clearance between a scope and a barrel when mounted.

4. Based on Riflescope Tubes

Finally, you can also check out the three sizes available based on riflescope tubes. These are 30mm, 34mm, and one inch. Each size has two circle halves, split horizontally so that the clamp around the scope body is held in place properly.

Scope Mount

Tips on Proper Selection of Scope Mounts

Now that you know the different sizes and factors that affect sizing, the last part of this guide offers tips on selecting them properly.

1. Identify Your Scope’s Tube Diameter

The first step in selecting the right mount size is to determine the diameter of your scope. The most popular tube diameters are 30mm, 34mm, and one inch. Knowing the correct diameter helps you figure out the type of base needed.

Note that traditional scope rings are designed to fit a particular action of guns like the Tikka T3 or Remington 700. The style of the scope ring also influences how you mount it in connection to your barreled action.

2. Decide Whether You’ll Use a Single-piece Mount or Independent Rings

This difference matters because single-piece mounts bode well with precision applications. That’s because of the greater surface area that can come in contact with the receiver.

However, some prefer two-piece rings because of the slight difference in weight. In the end, it will be up to you to determine which is more comfortable for you, though.

3. Check the Proper Height

Finally, don’t forget to ensure the right height. The determining factor here is the size of your objective lens. Look at the product pages of your rifle scopes of choice so that you can confirm which one you need.

Some experts recommend considering four sizes: 40 to 42mm for low, 44mm for medium, 50mm for high, and more than 55mm for extra high.

The Many Benefits of Choosing the Right Size

At the end of the day, the size factored into how you mount your scope will still depend on elevation adjustment. The knowledge of choosing the proper scope, different sizes, and other factors will make you mount your scope easier. Also, evaluating the type of shooting you’ll find yourself involved in is just as crucial in determining the correct size.

Beyond info on sizes, it is also best to learn how to measure scope heights on your own, with tried and tested formulas of measuring from base to either ring center or ring’s bottom edge. On top of that, not having the right size can compromise your shooting and even cause a lot of discomfort and poor eye alignment on your part.

Interesting Read: Do Airsoft Guns Need A License?

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