The Spanish rifle that became a German icon

Wars & Conflicts · Published 16 October 2026 · Updated 25 October 2026 Swipe more like this →

In short: In the mid-1950s, a Spanish engineering project aimed to revolutionize infantry combat. While its ambitious lightweight ammunition eventually faded, the rifle's unique roller-delayed mechanism survived, providing the essential blueprint for the legendary Heckler & Koch G3 battle rifle.

The CETME Model 58 was the brainchild of German engineer Ludwig Vorgrimler, who drew inspiration from the experimental German StG 45(M) and the French AME 49. The design utilized a roller-delayed blowback mechanism, a system that differs from the complete locking system found in the MG 42. To solve the persistent issue of cartridge cases sticking in the chamber, CETME engineers introduced a fluted chamber. These horizontal grooves allow cases to float on a thin layer of gas, aiding extraction and leaving a signature horizontal marking on spent brass.

The original development was driven by a quest for high performance with low recoil. Engineers developed the 7.92×4 .CA-001 cartridge, unveiled in 1953, featuring an aerodynamic, lightweight bullet with an aluminium core wrapped in a copper jacket. This 6.8-gram projectile was designed to maintain stability and accuracy up to 1,000 metres, even capable of penetrating various helmets. The reduced weight helped minimize the recoil impulse, making fully automatic fire more controllable.

As requirements shifted toward international standards, the rifle underwent significant transformations. Following requests from the West German Bundesgrenzschutz, the chamber was redesigned for the 7.62×51mm NATO round. This led to the Model B, which eventually served as the foundation for the widely deployed Heckler & Koch G3. While later variants like the Model C strengthened the rifle for the more powerful NATO loads, other experiments, such as the aluminium-heavy Model E, were discontinued after continuous fire caused rapid deformation.

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