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he M 35 was a gas-operated design, reminiscent of an earlier semi-automatic design of Vollmer—the 7.92×57mm Selbstladegewehr 29 (SG 29). Trials with Vollmer's Maschinenkarabine were conducted as early as 1935 at Biberach and later at Kummersdorf. The early version had a 20-round detachable box magazine and could fire at a rate of about 1,000 rpm. Development continued with the improved versions M 35A, M 35/II (1937) and M 35/III through 1938. The later versions had intentionally reduced rate of fire to only about 300–400rpm.[3] It weighed about 9.5 pounds (4.3 kg) and was about 38 inches (97 cm) long. About 25 prototypes were manufactured for testing.[1] The gun was apparently very expensive to manufacture, costing 4000 Reichsmarks,[2] although this was the unit cost for the prototype series.[4]

The cartridge developed also had several variants including 7.75×40.5 mm, 7.75×39.5mm, and possibly a 7.62mm version as well, and had a total length of approximately 55 mm. (The actual calibre was apparently 7.9mm, with a bullet 8.05mm in diameter.[5]) Muzzle velocity was about 700 m/s (2,280 feet per second). The boat-tailed bullet weighted 140 grains (9 grams).[6]

Vollmer MKb 35
Vollmer MKb 35/III - 7.75x40.5mm GECO

The Vollmer MKb 35 (German: Vollmer Maschinenkarabiner 35, "Volmer Machine Carbine 35") is a series of of experimental automatic rifles, which was developed by Heinrich Vollmer. Other names for the rifle include: Vollmer M35.
Vollmer MKb 35 - Original prototype model.
Vollmer MKb 35/I - Updated prototype model from 1936 (?).
Vollmer MKb 35/II - Updated prototype model from 1937.

Vollmer MKb 35/III - Updated prototype model from 1938.
Specifications

(Production: 1934 – 1938)

Type: Assault Rifle
Country of Origin: Nazi Germany
Caliber: 7.75mm
Cartridge: 7.75x39.5mm GECO / 7.75x40.5mm GECO
Weight: 9.5 lbs (4.3 kg)
Length: 38.2 in (97 cm)
Barrel length: ??
Capacity: 20 rounds Detachable Box Magazine
Rate of fire: 1000 rpm first prototype. 300-400 rpm next prototypes