Roth–Steyr M1907
Type	Semi-automatic pistol
Place of origin	Austria-Hungary
Service history
In service	1909–1945
Used by	Austria-Hungary, Austria, Kingdom of Hungary, Kingdom of Italy, Poland, Kingdom of Yugoslavia, Czechoslovakia
Wars	World War I, Polish-Soviet War, World War II
Production history
Designer	Karel Krnka
Designed	1907
Manufacturer	Œ.W.G. Fegyver- és Gépgyár
Produced	1908–1914
No. built	99,000
Specifications
Mass	1,030 g (36 oz)
Length	23 cm (9.1 in)
Barrel length	13 cm (5.1 in)
Cartridge	8mm Roth–Steyr
Action	Recoil operated[1]
Muzzle velocity	330 m/s (1,100 ft/s)
Effective firing range	50 m (160 ft)
Maximum firing range	100 m (330 ft)
Feed system	10-round integral box magazine, fed by stripper clip
Sights	Iron

The Roth–Steyr M1907, or, more accurately Roth-Krnka M.7^[2] was a semi-automatic pistol issued to the Austro-Hungarian kaiserliche und königliche Armee cavalry during World War I. It was the first adoption of a semi-automatic service pistol by the army of a major military power.^[3]

The Roth–Steyr pistol fires from an unusual style of locked breech. The bolt is very long. Its rear end is solid, except for a sleeve for the striker, but its front part is hollow and fits tightly over the barrel. The interior of the bolt has cam grooves cut into it, and the barrel has studs which fit into the grooves. When the pistol is fired, the barrel and bolt recoil together within the hollow receiver for about 0.5 in (13 mm). During this operation, the helical grooves in the muzzle bush cause the barrel to turn 90 degrees clockwise, after which it is held while the unlocked bolt continues to the rear, cocking the action as it does so. For safety in the intended use by mounted cavalry, the pistol has a heavy trigger pull against the firing striker spring, similar to a hammerless revolver.^[4]

The Roth–Steyr is a locked-breech pistol, which allows the barrel and bolt to recoil together within a hollow receiver. It is chambered for a cartridge specific to this model. The Roth–Steyr does not have a detachable magazine, but features a fixed magazine loaded from the top with stripper clips. The sights are fixed, the grips are wooden and terminate in a lanyard ring. Rifling is four grooves with right-hand twist.

The Bundeswehr Museum of German Defense Technology in Koblenz has one of these specimen in its collection.

The pistol was developed by the Czech designer Karel Krnka [cs], working for the ammunition company of Georg Roth, based on the earlier Roth–Theodorovic pistol. After development and tests of several prototypes, the final version of the Roth–Krnka won a contest for an Army pistol in 1906, and was adapted as a standard gun of Austro-Hungarian Army as: Repetierpistole M.7. (self-loading pistol M1907).^[2] Since Roth had no weapon production capabilities, the government bought all the rights and ordered production in the Österreichische Waffenfabriksgesellschaft (OEWG) in Steyr and FEG in Budapest. From 1908 to 1914, approximately 99,000 weapons were manufactured (the Army received 59,334 from Steyr and 38,213 from FEG, plus several hundred were sold on the civilian market).^[2] Despite common name for the pistol Roth–Steyr, Steyr works did not participate in its design, apart from minor improvements.^[2] Following the dissolution of Austria-Hungary, the Roth–Steyr was fielded by Yugoslavia, with limited use during World War II by the Austrians and Hungarians. Italy received a number of pistols as World War I reparations from Austria-Hungary, and these pistols were used by Italian troops during World War II.^[4] They were used also in Czechoslovakia and Poland.^[2]

*not to be confused with ACP

The company was looking forward to get a military contract for their brand new gun. The pistol was originally chambered for 8x18 mm Roth Steyr however the United Kingdom and United States asked for a gun that would use a bigger cartridge, most preferably a 0.45 in (11 mm) Cal.

The trials are exhaustively described in the Minutes of the Small Arms Committee, starting in April 1900 with the Borchardt and ending with the adoption of the .455SL Webley in 1912.

The first trial of the 11.35 mm (0.447 in) Roth is recorded in Minute 635 of June 1902. An 8mm Roth had been tested earlier in October 1900. In 1902, Roth submitted two 11.35 mm (0.447 in) and one 8mm pistol of “improved design”. The committee reported that the ammunition had a bullet of 198 gr (12.8 g) with a copper envelope with exposed lead tip with 5 gr (0.32 g) of smokeless powder.

In March 1903, another Roth pistol was tested (Minute 745), this time in “.0.44 in (11 mm) caliber” with a bullet of 247 gr (16.0 g) which gave a velocity of 975 ft/s (297 m/s). The conclusion was that the method of loading was unsatisfactory, pull-off too heavy, too many openings to admit dust but Figure of Merit was good.

The last mention of a Roth is Minute 1077 of May 1909 when an 11 mm (0.43 in) (0.403 in (10.2 mm) actual) pistol, described as a “Mark II”, was tested. Recorded as having an eight round magazine loaded by charger. The velocity was 816.8 ft/s (249.0 m/s) and penetrated ten of the 0.5 in (13 mm) boards, spaced 1 in (25 mm) apart at 25 ft (7.6 m). Bullets weighed 200 gr (13 g) grains with steel envelope and 4.7 gr (0.30 g) of smokeless powder.

Conclusions were that it was a handy and well balanced pistol with good certainty of action. It performed well in the sand test, strips easily, and had less recoil that the Webley pistol. There was no safety catch, which was a disadvantage.

A prototype in 10.3 mm (0.41 in) cartridge was tested at the Springfield Armory and it failed the 1,250 rounds endurance test with 191 malfunctions of 9 different types of ammunition and a broken extractor.

• 8mm Roth–Steyr
• 8 mm caliber
• List of handgun cartridges
• "Roth - Theodorovic Pistol".
• "Roth - Sauer Pistol".

• Karl R. Pawlas (September 1971). "Pistole Roth-Steyr, Modell 1907 und ihre Vorläufer". Waffen Revue (in German). No. 2. pp. 237–264.
• Mötz, J.; Schuy, J. (2007). Österreichische Pistolen: Vom Ursprung der Selbstladepistole : Repetier- und Selbstladepistolen in Österreich-Ungarn 1884 bis 1918 (in German). Vol. 1. Selbstverl. J. Mötz. ISBN 978-3-9502342-0-6.

Wikimedia Commons has media related to Roth-Steyr.

• US 616260 
• US 616261 
• PISTOL, SEMI-AUTOMATIC - AUSTRIAN PISTOL M07 "ROTH-STEYR" 8MM SN# 13858 - Springfield Armory Museum
• Forgotten Weapons: Roth-Steyr M1907 on YouTube
• Forgotten Weapons: Prototype .45 Caliber Roth-Krnka for US and UK Trials on YouTube
• Forgotten Weapons: Roth Steyr Developmental Models 1904 and 1906 on YouTube
• Small Arms of WWI Primer 026: Austro-Hungarian Roth-Krnka M.7 Pistol on YouTube