If you’re a new shooter trying to use scope rings on your firearms, you may be confused with all the different sizes and types available.
So, what size do you really need?
Fear not, as we are here to help you figure out the right size for your scope ring!
Contents
What Are Scope Rings?
These types of rings are used to hold the scope in place on the rifle. The ring mounts themselves are held onto the rifle using a scope base.
There are many different bases.
When talking about bases, the base you get should be from the SAME manufacturer.
Types of Rifle Scope Rings
Before finding the right size, we must first understand the different types of rifle scope ring and base.
Weaver Style
Probably the most common type of mounting system out there, the weaver-style mounting system uses a flat ⅞-inch broad base with crosswise recoil slots.
The recoil slots on the Weaver base are .180 inches wide and are made to perfectly fit Weaver rings with the appropriate recoil lugs.
This lets it slots together like a jigsaw puzzle that doesn’t move from recoil!
These bases are made of aluminum or steel and can come in one or two pieces. This allows the shooter to swap scopes or remove them for maintenance or travel.
There are also some Weaver bases explicitly made for certain guns.
An example would be the Weaver style one-piece aluminum base explicitly made for the Remington 700.
Picatinny/1913
Picatinny rings are very similar to Weaver rings.
The main difference between them is that the recoil slots and recoil lugs on Picatinny bases are thicker than the recoil lugs and slots on a Weaver-style base.
Specifically, the recoil lugs and slots on Picatinny rings and bases are .206″ wide, while the recoil lugs and slots on Weaver style rings and bases are .180″ wide.
Thus, Weaver-style rings CAN fit in Picatinny bases, but not so much the other way around.
Additionally, a Picatinny rail allows for multiple optics to be fitted evenly along the top of the rifle.
Leupold Style
This style is drastically different from the two abovementioned styles.
Leupold-style plates are usually made of steel and are available as either one or two pieces.
A caveat of this style is that it can be difficult to detach.
Since the halves of the rings are loosely assembled, you will need a screwdriver handle or a one-inch wooden pole to gain leverage to turn them into the base.
To detach Leupold rings, you need to separate the top half.
.22 and 3/8″ Dovetail
Dovetail rings are commonly used in grooved receivers found on .22 rifles or airguns. These receivers consist of cuts that run lengthwise across the top of the gun.
These cuts on the receiver are deep enough for dovetail rings to have a firm grip. If the metal on the receiver is not thick enough for the grooves, a ⅜” base is screwed onto the receiver.
⅜” dovetail rings come in various sizes that can hold scopes with main tubes of one inch, ¾,” ⅞,” etc.
Some standard .22 rings are called a “one inch ⅜” dovetail ring” or a “one-inch tip-off.”
The great thing about dovetail rings is that they are fairly EASY to install at home! Some drove receivers are already drilled and tapped for use with Weaver-style bases.
These are ideal for when your rifle is designed for a broad base, as the riflescope rings will have more area to grab.
Extension Rings
There are many different rings and designs for extension rings. Additionally, extension rings allow for a shorter mounting distance on a longer receiver.
How to Choose the Right Scope Ring Size
The size you need depends on your rifle size and model. There are two things to keep in mind when looking for the right size.
Ring Width
The ring width should match the diameter of the scope’s main tube.
There are, in general, three sizes for the diameter of the tube:
- 1 inch
- 30 mm
- 34 mm
If the ring doesn’t measure the same as the scope’s diameter, it simply will not fit.
Ring Height
Your scope’s ring height refers to how far above the bore the ring must be mounted for the firearm and optic to work properly.
Ideally, you’ll want the ring to be as CLOSE to the bore as possible. The closer the ring is to the bore, the fewer adjustments that have to be made.
However, it should still be far enough for the firearm to work properly.
To be able to measure what height you need, here are some measurements you will need to get (measuring all in inches):
- Rail height: height measured from the top of the barrel to the top of the base/rail
- Ring height: height measured from centerline of scope ring to top of the rail
- Bell diameter of riflescope
Once you have all these measurements, you can then use the following formula:
(rail height + ring height) – (bell diameter x 0.5) = ideal ring height
Let us put this into an example.
If you have a 50mm riflescope with a 30mm tube length, the ideal height would be around 0.3 inches.
Take note that this computation may vary slightly depending on other factors.