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Heym SR 20

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Repeatable Mounts
Pivot Mounts

About the Heym

HEYM was founded in 1865, in Suhl, Germany, by Friedrich Wilhelm Heym. Throughout its history, the company has encountered many hardships. These include economic crises, the Nazi regime, and the post-WW II occupation of Germany. Consequently, it has changed its location more than once. Despite that, the Heym brand remains deeply respected and its guns widely admired.

As early as 1891, HEYM manufactured and patented the first hammerless drilling, a three-barreled hunting rifle with three triggers and three hammers on the same axis. Afterwards, the company began to expand, producing drillings, shotguns, and over and under rifle-shotgun combinations. They predominantly exported their products to Russia and the USA. In 1920, the company began producing Anson & Deeley Drillings, double rifle drillings, three trigger drillings, double rifles, and rifle shotgun combination guns.

After World War II, HEYM made a fresh start in the American part of divided Germany. There, the company manufactured products such as cuckoo clocks, slide rules, and spinning wheels since the ownership and making of guns were not allowed. HEYM restored its primary activity in 1952 when the revised laws again allowed the ownership and making of certain hunting and sporting guns.

In 1998, the owner of the company became Thomas Wolkmann. The company's name was first changed to HEYM Waffenfabrik GmbH (Limited), and then in 2007 to the present name, HEYM AG.

Heym SR 20 Rifle Review

Heym SR 20 is a push-feed bolt-action rifle and a long action version of the Heym SR series. In the middle of the 1960s, the Heym company signed a working agreement with Mauser to produce bolt-action rifles under the Mauser label. However, at the beginning of the '70s that deal was terminated and Heym renamed the existing products to the Heym SR series, including some minor changes in the design of their bolt-actions.

Like the SR 40 model, Heym SR 20 comes with a blued metal drilled and tapped receiver which houses a bolt with dual locking lugs that lock up with the action’s casing. Structurally, the rifles are the same, with the only major difference being the action length. Both utilize a Mauser-type locking system allowing for a smooth bolt operation and are available in both - left and right-side versions. Accordingly, the three-position safety catch which locks the bolt and the trigger can be positioned on either side. When safety is put in the middle position, the bolt can be safely opened for unloading the chamber.

Standard action magazine can hold up to five and the magnum action up to three cartridges which can be removed using a hinged floorplate. In addition, the user can choose between three trigger options, namely a single-stage adjustable, single set, or double set trigger that is surrounded by an aluminium trigger guard. The rifle features pre-mounted iron sights with the rear one having an adjustable elevation notch.

Possible barrel lengths for Heym SR 20 are 521 mm (20.5-inch), 597 mm (23.5-inch), 648 mm (25.5-inch). 

Heym SR 20, chambered for .30-06 Spr.

Figure 1: Heym SR 20, chambered for .30-06 Spr. (Source. https://auctionet.com/sv/1542750-sr20-kal-30-06-25486/images#image_1)

Heym SR 20 can be chambered for the following calibres*:

  • 5.6x57

  • .243 Win.

  • 6.5x55

  • 6.5x57

  • 6.8x68 

  • .270 Win.

  • 7x57

  • 7mm Rem. Mag.

  • 7x64

  • .308 Win.

  • .30-06 Spr.

  • .300 Win. Mag.

  • 9.3x62

  • .375 H&H Mag.

*Calibre choice depends on the variant.

The rifle is available in the following variants:

  • Heym SR 20 N

  • Heym SR 20 G

  • Heym SR 20 L

Heym SR 20, chambered for .30-06 Spr.

Figure 2: The receiver of Heym SR 20, chambered for .270 Win. (Source: https://www.gunsinternational.com/guns-for-sale-online/rifles/heym-rifles/heym-model-sr-20-l-full-stock-270.cfm?gun_id=100701867)

Skica dimenzij

A: 21.9 mm

B: 103.2 mm

C: 12.7 mm

BHU: 4 mm

Ø: 6-48

R1: R14/30°

R2: R18

Which Rifles Have Interchangeable Mounts 

Two-piece mounts

All the rifles listed in the category below have two-piece mounts interchangeable with Heym SR 20. To meet interchangeability conditions, two-piece mounts must match in all dimensions except the B distance. B distance can vary because two-piece mounts can be installed and adjusted closer or further apart. Rifles that meet such criteria are:  

  • Remington 798

  • Kufstein 2165 Voere

  • Zastava M70 Bolt action

  • Parker Hale Safari 1200

  • Mauser M98 Standard

  • Mauser 2000

  • Mauser 3000

One-piece mounts

All the rifles listed in the category below have one-piece mounts interchangeable with Heym SR 20. For one-piece mounts to fit on a rifle, mounting surfaces on these rifles must match in every dimension. The rifle that shares the same dimensions and mounting surface with Heym SR 20 is:

  • Mauser 2000

  • Mauser 3000

Our Recommendations for Mounts 

Fixed Mounts

If you are looking for a fixed mounting solution for your Heym SR 20, we recommend this reliable two-piece mount produced by the German company MAK that is made of steel and comes with a thirty-year warranty.

Detachable Repeatable Mounts

Detachable mounts can be easily installed and removed from the rifle which is especially useful for cleaning and maintenance purposes as well as versatility in using multiple optics on a single weapon. We recommend this detachable two-piece steel pivot mount made by the German company MAK that comes with a thirty-year warranty and is an ideal fit for the Heym SR 20. 

Help Us Build Our Riflescope Mounts Database

If you happen to own this or any other rifle, we would appreciate it if you could help us expand our database by sending us some photos of the rifle receiver (the bare mounting surface of the rifle without the mounts installed). For your help, our company offers a fair return in terms of practical rewards.

Please send us an email for more information. You can contact us here: info@optics-trade.eu

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VIDEO

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