Heckler & Koch: The Gray Room, Part I

by
posted on July 15, 2020
Watch our American Rifleman TV video above to learn about Heckler & Koch’s Gray Room and the designs that established the German-based firearm manufacturer.

Man standing with hands crossed in gray room with guns on walls.

Residing in Ashburn, Va., at the U.S. home of Heckler & Koch (H&K) is The Gray Room, a hidden gem brimming with prototypes and rare examples of H&K’s manufacturing expertise. Rooted in Oberndorf, Germany, H&K has built a worldwide reputation for its design and manufacturing capability.

Photographs of the three men who founded Heckler & Koch firearms company.

Edmund Heckler, Theodor Koch and Alex Seidel, all former Mauser engineers, started in the late 1940s what would become today’s Heckler & Koch. The newly-formed Germany engineering firm quickly morphed from a manufacturer of bicycles, machine tools and sewing machine parts to a firearm builder following an official West German request to product a new rifle for its army's infantry.

Cutaway view drawing of Heckler & Koch's roller-delayed mechanism.

What the Bundeswehr received from the fledgling company is known as the G3, a semi-automatic rifle with Spanish CETME roots that operates via short-recoil operation by way of a roller-locking mechanism. This new and innovative mechanism paved the way for H&K and the success it has earned over its 70+ years of manufacturing history.

Parts diagram for a G3 rifle.

The roller-delayed blowback system was the centerpiece of H&K shoulder-fired small arms production for almost 40 years. During the mid-1960s, production tapered for the G3, which led to the production of the MP5 submachine gun that fired the 9 mm Luger cartridge. The select-fire MP5 pistol is still in use today and commercial, semi-automatic variants are also available.

MP5N cutaway mounted on a gray wall.

As time advanced into the 1970s, H&K was tasked to design a replacement for its previous G3 design. The order was to create a firearm capable of firing caseless ammunition. The result became known to be the G11.

G11 rifle with helmet and ammunition on white background.

Creating the G11 weapon system was a joint effort between H&K, Dynamit Nobel and Hensoldt. Dynamit Nobel supplied the caseless ammunition, and Hensoldt engineered an integrated optic, which doubled as a carry handle. The result was a shoulder-fired arm that featured an ultra-high cyclic rate due to the advanced ammunition design.

Brochure for the G11 rifle and ammunition.

Technical issues of the G11 system slowed development, and the design faded as East and West Germany reunited in the early '90s. The outdated and large G3 rifle system needed refinement and H&K came to market with its G36 to assist the German army with a lightweight firearm that allows its operator to carry more ammunition.

G36 rifle made of clear plastic to view internal mechanisms.

This lightweight gas-operated G36 rifle chambers the smaller and effective 5.56x45 mm NATO cartridge and employs use of a short-recoil gas-operating system that does away with the legacy roller-delayed bolt design in favor of a rotary-bolt locking system.

SP5K pistol close-up view.

Follow along with American Rifleman’s Joe Kurtenbach and his visit with Heckler & Koch’s Grey Room to learn more about the company’s manufacturing history.

Latest

Walther Arms Model 4 Ihtog 2
Walther Arms Model 4 Ihtog 2

I Have This Old Gun: Walther Model 4

After Walther Arms entered the semi-automatic pistol market in the early 20th century, its designs quickly evolved. The Model 4 was one of the most popular pre-World War I pistols made.

New For 2025: Taurus 850

Taurus unveiled its new 850 revolver, a .38 Spl.-chambered, five-shot revolver designed for concealed carry.

Snipers Below Freezing: An Assessment Of Finnish & Soviet Sniping In The Winter War

The remarkable performance of Finland’s small military in holding back the Red Army during the Winter War of 1939-1940 drew the attention of many military planners, particularly those with an eye towards engaging in combat with the Russians in the frozen north.

Handloads: A Tokarev Target Load

Finding surplus 7.62x25 mm Tokarev ammunition was easy 15 years ago. When it finally dried up, my Zastava M57 went to the very back of the safe. That was until I discovered that X-Treme makes an affordable 110-grain .308" copper-plated bullet.

New For 2025: Military Armament Corporation MAC-5 & MAC-5K

Military Armament Corporation is now shipping its MP5-like MAC-5 and MAC-5K large-format pistols.

The Rifleman Report: “To Keep And Bear Arms”

When it comes to the three major firearm types—rifle, shotgun and handgun—along with the ammunition and accessories they require, we strive to cover each as best we can. And even though any of them could be pressed into sporting or defensive use, all are only as useful as they are available to responsible citizens.

Interests



Get the best of American Rifleman delivered to your inbox.