Two piece scope mounts

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Repeatable Mounts

Introduction

Two piece scope mounts are definitely the most common mounts available. They can be recognized by separated front and rear mounting elements.

Personally, I like the idea of the open upper part of the receiver; it is easier to load cartridges in the chamber if there is no obstacle, like rail or other mounting element between bases. This type of mount is easy to produce and is usually quite affordable.

Firstly, we have to understand two different possibilities of two piece scope mounts:

single part design and
two-part design.

Single part design

Single part design where ring and base are made of one piece, is quite common.

Single part design mounts are suitable for different dovetails:

11 mm,
Tikka T3,
CZ 527,
CZ 550 and others,
as well as for Weaver and Picatinny rails.

It means that you have two different pieces of scope mounts – front and rear and each of them is made only from one part of raw material.

Two-part design

Two part design is common as well, especially for mounts with separated bases and great advantage can be achieved that way in the terms of windage adjustability.

Each of them (front and rear piece) have separated base and ring that have to be joined together (normally with screws). Of course, higher number of parts means also higher possibilities of failures.

There are also two piece scope mounts that can be screwed directly on the receiver (even if the rifle does not have dovetail) available.

Talley is one of the most-well known manufacturers of these mounts. Mounting of all of the two piece scope mounts by gunsmith is absolutely advisable. They are quite hard to adjust and to mount without flexing or damaging the scope in some other way.

PROS

All of two-piece scope mounts (single and two-part design) are normally lightweight, elegant design can be easily achieved and they are also affordable (in most cases).

CONS

Because of separated design and a general need for great rings alignment, these mounts are usually difficult to mount.

Proper alignment of front and rear part might be hard to attain. This is the reason why experienced gunsmith is normally needed. It is also important and should not be forgotten that two part designed mounts have many joints and these joints could potentially fail.

Is lapping needed with Two-piece scope mounts?

Lapping process with two-piece scope mounts is normally needed or at least advisable. If lapping is not done, there is a huge possibility of flexing the scope during mounting or at least making stress and deformations in the material.

If there is no lapping done during mounting process of two-piece scope mounts, there is still bedding possible to correct imperfections.

Bedding scope bases is a process of making hard bonds between receiver and bases with epoxy, Loctite blue glue or any other bedding liquid that can assure solid bond and precise connection of parts. It is good to know that bedding can be done also between scope tube and rings, not just between the rifle and bases of the mount.

Conclusion

Two piece scope mounts appear light and elegant and there are many available mounts of this kind on the market.

They are popular also because of their affordable price, but on the other hand – they might be a nightmare to mount, even for experienced gunsmiths.

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Rusan Roll-off rings with extension, 19 mm rail, 34 mm, Q-R

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UTG Accu-Sync QD Scope Rings, 25.4 mm

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UTG Accu-Sync QD Scope Rings, 30 mm

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UTG Accu-Sync QD Scope Rings, 34 mm

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UTG Max Strength QD Scope Rings, 25.4 mm

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UTG Max Strength QD Scope Rings, 30 mm

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There are two terms found for similar thing: quick release scope mounts and quick detach scope mounts. Term quick release scope mounts is used mostly in Europe and quick detach scope mounts is used mainly in USA, although they mean the same thing. With these terms we describe a scope mount that can be quickly removed from the rifle in the field without using any tools and quickly attached back on the rifle when needed.

Main advantages:

possibility to use multiple scopes on the rifle,
easy transportation of the scope and the rifle separately,
if scope fails, it is possible to immediately detach it and use iron sights.

FIXED vs DETACHABLE scope mounts

Fixed scope mounts are mounted to the rifle with screws and sometimes even with glue. This means that it is impossible to attach or detach the scope mount using bare hands without using tools. It also means that they are not meant for constantly being attached on or detached off the rifle. Once you screw the mount on the rifle, it normally stays there for a longer period of use.

Detachable scope mounts offer possibility to attach or detach them without using any tools. This is extremely handy while transporting the rifle and the scope separately and it also offers multiple solutions of different optics on the same rifle. Detachable scope mounts can be attached or detached from the rifle in a matter of seconds, using bare hands.

Fixed Mount

Fixed Mount

DETACHABLE vs REPEATABLE scope mounts

It is important to know and understand expressions “detachable” and “repeatable” while talking about scope mounts. Term detachable scope mounts implies scope mounts that can be quickly attached or detached without using any tools. However, when you detach this kind of mount and attach it back on the rifle, it is recommended to zero the rifle before using it again. Procedure of detaching and again attaching the mount will probably need a sighting in before next shooting, because mount will not be secured on the rifle in the perfectly same position and conditions as it was before detaching it off the rifle.

On the contrary, repeatable scope mounts are most sophisticated mounts. These scope mounts are also detachable, however – they provide removing scope from the rifle and attaching it back again without zeroing the rifle every time. This means that they are made more precisely and that they are offering a possibility of using different optical sights / scope on the same rifle. These mounts are ideal for hunters who can use optical and iron sights interchangeably, depending on the needs in different situations. With the repeatable scope mounts, it is useful to keep them oiled as well as the upper part of the rifle, so that repeatability is more ensured. With a touch of oil, the repeatability might be better, because parts of the mount will always return to their previous locations.

Different types of repeatable scope mounts:

Pivot mounts,
Dentler mounts,
Picatinny repeatable mounts,
12 mm dovetail repeatable mounts (for break barrel rifles, such as Steyr Duett, Blaser B750, Fair Combi, Fair SLX 800, Bettinsoli rifles, etc.),
Original repeatable mounts, made by manufacturers of rifles for their rifles (Blaser mount, Sauer SUM mount, Mauser M03 mount, Steyr Monoblock mount, etc.).

Repeatable Mount

Repeatable Mount

TIP OFF / ROLL OFF vs SLIDE ON mounts

Nowadays, there are a whole lot of different possibilities, made for attaching riflescopes on the rifles. There are also a lot of different expressions, having the same meaning. It is good to know that tip off and roll off mounts are basically the same thing. They represent quick release scope mounts for dovetails and rails which can be rolled or tipped off the rail vertically to the side of the rail. On the contrary, there are also slide on mounts available on the market. They represent quick release scope mounts that can be slided on or off the rail or dovetail from front or rear side of the rail / dovetail. All of these expressions are mainly used for separate rings that can be attached to the rails / dovetails. As far as functioning the rifle, it does not matter which one of these mounts you choose – tip / roll off or slide on mounts. If they are installed correctly, they are all going to work. However, the main difference between them is the principle of attaching them on rails on dovetails.

Slide On Mount vs. Roll Off Mount

Slide On Mount vs. Roll Off Mount

Two piece scope mounts

Sub Categories

Introduction

Single part design

Single part design mounts are suitable for different dovetails:

Two-part design

PROS

CONS

Is lapping needed with Two-piece scope mounts?

Conclusion

Rusan Roll-off rings with extension, 19 mm rail, 34 mm, Q-R

UTG Accu-Sync QD Scope Rings, 25.4 mm

UTG Accu-Sync QD Scope Rings, 30 mm

UTG Accu-Sync QD Scope Rings, 34 mm

UTG Max Strength QD Scope Rings, 25.4 mm

UTG Max Strength QD Scope Rings, 30 mm

VIDEO

FIXED vs DETACHABLE scope mounts

DETACHABLE vs REPEATABLE scope mounts

TIP OFF / ROLL OFF vs SLIDE ON mounts

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Two piece scope mounts

Sub Categories

Introduction

Single part design

Single part design mounts are suitable for different dovetails:

Two-part design

PROS

CONS

Is lapping needed with Two-piece scope mounts?

Conclusion

VIDEO

FIXED vs DETACHABLE scope mounts

DETACHABLE vs REPEATABLE scope mounts

TIP OFF / ROLL OFF vs SLIDE ON mounts

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