Heym SR 20

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)

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: [email protected]

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ERAMATIC Swing (Pivot) mount, Picatinny Rail

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VIDEO

Introduction

In recent years we can observe that a trend of Picatinny rail has become widespread and global. It is driven by the NATO standardized rails, more commonly known as the Picatinny rail standard. Picatinny rail being the New Jersey Arsenal that developed it in 1995.

These mounting options are revolutionary. The biggest and best advantage being that the Picatinny rail can be used its entire length and not bordered to a few pre-designed slots like for example the Weaver rail standard was before.

The other main advantage is the ease of use and interchangeability. If a product is meant for a Picatinny rail design it will fit all Picatinny-rails, no matter the manufacturer or date of production.

Picatinny/Weaver Rail

Picatinny Rail and Weaver rail profile

Design

The Picatinny rail is almost exclusively crafted from a single piece of metal (in some cases aluminum). In this manner, the axis of the Picatinny rail is perfectly straight and aligned with the axis of the firearm. Therefore the rifle scope which is mounted onto this kind of configuration is certainly aligned with the rifle / gun and the trajectory of the ammunition.

Weaver rail design on the other hand is usually manufactured in two separate pieces, greatly increasing the possibilities for the axis to be crooked, overlapping, and out of line.

It is always harder to align two separate pieces to a third line than it is to align one piece to another. In this way, the lapping of two mounting rings on a single-piece Picatinny rail is no longer required.

The single-piece rail will assure that both rings are perfectly aligned to each other and that no unwished stress is transferred to the riflescope.

Picatinny compare to Weaver Rail

The Picatinny rail itself is an evolutionary step forward from the older Weaver rail. The main difference between Picatinny rail and Weaver rail is the spacing of the slots. Picatinny rail design has them evenly placed exactly 5.23 mm from one slot to the other, 3 mm deep. For this reason, the mounting options are repeatable and the same as other firearms using the Picatinny rail standard.

Interchangeability was a major driving force in the development of the new standard as different NATO armies need to be compatible with each other.

Weaver rail has 3.8mm wide slots and these slots can be placed anywhere on the Weaver rail and in any number that the producer wished.

Advantages of Picatinny design

A big advantage for using the Picatinny rail design is the ever-present recoil stop. Furthermore, the manufacturing of the rail is not very technically demanding and can be done without the use of state-of-the-art machines which greatly reduces the cost of the finished product, making it very affordable.

The Picatinny rail is easy to mount and usually, this type of configuration does not transfer negative stresses and forces from the fired weapon to the rifle scope.

In addition, the Picatinny rail with its very long useable surface works well for mounting longer rifle scopes or to achieve optimum eye relief.

The durability and toughness are other big pluses for this solution.

Manufacturers of Popular Models

A majority of the Picatinny rings are fixed, but a number of best rated European manufacturers (EAW, MAK,..) have, in recent years, put a lot of effort into the development of detachable ring with100% repeatability, with which it becomes easy to remove the scope from the weapon without the use of tools.

No re-zeroing is needed with such mount options, but these models tend to be expensive.

Weaver and Picatinny Rings

Picatinny rail and weaver rail share one more thing. It is possible to use the Weaver ring and the Picatinny ring on the Picatinny-rails, but it is usually impossible to use the Picatinny ring on the Weaver base. The reason being the above-mentioned positioning and spacing of the slots.

Picatinny mounts have a 5mm recoil stop that goes into the rail slot and since
Weaver rail only has 3.8mm wide slots such rings do not fit on Weaver rails.

Due to this reason, the Picatinny-rails are popular and prevailing on the market in recent years and eventually, these options will completely oust the Weaver rail from the market.

Heym SR 20

About the Heym

Heym SR 20 Rifle Review

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

The rifle is available in the following variants: