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Modern Firearms - Schwarzlose M1907 and M1907/12 machine gun

Machine guns introduction
Austria
Schwarzlose M07 M07/12 new
Steyr-Solothurn MG 30
Steyr AUG /Hbar
Belgium
FN Model D
FN Minimi
FN MAG
FN BRG-15
China, People's Republic
Type 67 GPMG
Type 88 GPMG
Type 95 LMG
Type 77 HMG
Type 85 HMG
W-85 HMG
Type 89 HMG
Type 02 / QJG 02 HMG
Czech Republic
ZB 26
ZB 53 / Vz.37
type 52 & 52/57
type 58 (UK vz.58)
Denmark
Madsen LMG
Madsen-Saetter
Finland
L/S-26
Valmet KvKK 62
France
Chauchat CSRG M1915
Hotchkiss Portative new
Hotchkiss M1914
Hotchkiss M1922 LMG
Hotchkiss M1930 HMG
MAC M1924/29
AAT Mod.52
Germany
MG 08, MG 08/15, MG 08/18
MG 13
MG 34
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MG 42 and MG 3
HK 21 and 23
HK MG 4
Great Britain
Vickers Mk.I
Hotchkiss Portable Mk.I new
Lewis
Vickers-Berthier
Bren
L86A1 SA-80 LSW
Israel
Dror
Negev
Italy
Fiat-Revelli M1914 M1935 new
Breda M1930 new
Breda M1937 new
Japan
Type 03 & Type 92 new
Type 11 new
Type 96 & Type 99
Type 62
Mexico
Mendoza new
Russia / USSR
Maxim M1910/30
Degtyarov DP DPM RP-46
Degtyarov DS-39
Degtyarov RPD
Kalashnikov RPK
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Pecheneg
DShK DShKM 12.7
NSV 12.7 'Utes'
Kord 12.7
KPV 14.5
Singapore
STK Ultimax 100
CIS .50 MG
South Africa
Vector SS-77 / Mini-SS
South Korea
Daewoo K3
Spain
CETME Ameli
Sweden
Knorr-Bremse m/40 new
Switzerland
W+F Lmg 25
SIG KE-7
Steyr-Solothurn MG 30
SIG MG 50
W+F MG 51
SIG MG 710
USA
Benet-Mercie M1909 new
Lewis
Browning M1917 M1919
Browning M1918 BAR
Johnson M1941 M1944
M60
M16 LSW / LMG
M134 Minigun
XM214 Microgun
Stoner 63
M249 SAW
M240
Mk.48 mod.0
Browning M2HB .50 cal
XM312 .50 cal
LW50MG

Gatling, Minigun, Vulcan

all texts and some pictures
copyright © 1999-2009
by Max R. Popenker
and can not be used without author permission

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Schwarzlose M1907 and M1907/12 machine gun (Austro-Hungary / Austria)

Schwarzlose M1907 machine gun on Dutch-made M\25 tripod, with AA sight

Schwarzlose M1907/12 machine gun on standard Austrian tripod; spade grips are folded up
Image courtesy of James D. Julia auction house, Maine, USA

Schwarzlose M1907/12 machine gun on standard Austrian tripod; spade grips are in ready position, and a shoulder stock is attached
Image courtesy of James D. Julia auction house, Maine, USA

Schwarzlose M1907/24 (Vz.24) machine gun, interwar Czechoslovak conversion to 7.92x57 mauser caliber; note that it has longer barrel and jacket

Caliber	8x50R Mannlicher and others
Weight	20 kg (gun body) + 3 kg (water) + 20 kg (tripod)
Length	1067 mm
Barrel length	527 mm
Feed	belt
Rate of fire	400 rounds per minute

German arms designer Andreas Wilhelm Schwarzlose patented a basic design for a machine gun in 1902. He subsequently sold his patent rights to the Steyr arms factory in Austria, which produced the first guns of the Schwarzlose pattern in 1905. After two years of trials and development, the military forces of the Empire adopted the Schwarzlose machine gun in 1907; this gun was also later adopted in a range of calibers by the Netherlands and Sweden (who both manufactured Schwarzlose machine guns under licence until the 1930s), and by Greece, Serbia, Romania, Bulgaria and Turkey – all before the World War I. In 1912 it was modified with the introduction of stronger parts and slightly reshaped retarding levers (struts). The primary visible difference between original M1907 guns and modified M1907/12 guns is the lack of the gap between the hump on the receiver and the barrel jacket on the latter guns.
After the WWI and the fall of the Austro-Hungarian Empire, a great many Schwarzlose guns were adopted by smaller countries that emerged from the remains of the Empire, such as Czechoslovakia (which put the gun into production) and Hungary. Many Schwarzlose guns also went to Italy as war reparations, and subsequently saw some use during WW2, mostly in Africa in the original 8x50R caliber. Another user of Schwarzlose machine guns was Russia, which captured several thousands of Austrian machine guns during the early parts of World War One.
The Schwarzlose machine gun, although overshadowed by more famous weapons such as the Maxim or Browning, has its own merits. It is quite simple in construction, robust in service, and usually quite reliable. Its drawbacks come from its basic design, which centers on a retarded-blowback action. This action calls for a relatively short barrel so that the chamber pressure drops before the case begins to leave the chamber; otherwise it would rupture – although when the Czechoslovak army converted their old 8x50R Schwarzlose machine guns to the more powerful 7.92x57 Mauser ammunition, they had no problems associated with high pressure, even with new, significantly longer barrels. Nevertheless, most of the Schwarzlose guns retained short barrels throughout their service life. This obviously limited the muzzle velocity and thus the maximum range and possible bullet penetration at any given range, compared with contemporary guns with a locked breech. The short barrel also called for a dedicated flash hider, to suppress the significant muzzle flash which otherwise would blind the gunner at night. Finally, the lack of primary extraction required an integral oiler, which squirted a small amount of oil into the chamber just before chambering the next round. Nevertheless, the Schwarzlose was a good weapon and saw considerable use through both world wars, although during the Second World War it was mostly relegated to second-line troops, fortifications and other such uses.

The Schwarzlose machine gun is a retarded-blowback operated, water cooled, belt-fed weapon that fires from a closed bolt. The method of operation requires a heavy breechblock, connected to the receiver through a pair of knee-joint struts. When the bolt is in battery, the struts are folded forward, with their joint axis lying relatively low above the barrel axis. Upon firing, the pressure of the powder gases acts on the breechblock through the base of the cartridge case. The rearward movement of the breechblock unfolds the struts, but because of a carefully arranged redirection of forces through the struts and joints, most of the initial pressure is transferred to the receiver. Upon further recoil, joint axis rises above the barrel, and thus the recoil force is re-distributed with more and more of it being used for bolt acceleration. Upon recoil, the bolt compresses a massive and powerful return spring which forces it forward and into battery once the recoil stroke is completed. The charging handle is attached to the axis of the forward strut, and has to be rotated back to cycle the bolt.
Due to the lack of primary extraction, the Schwarzlose has to use oiled cartridges. To avoid the problems associated with factory-oiled or waxed ammunition (which tends to collect fine dust and then cause jams) the gun has an internal oiling system which squirts a small amount of oil into the chamber just before the chambering of each round. This system includes an oil reservoir, located in the receiver’s top cover, and a small oil pump, which is operated by the reciprocating bolt.
The belt feed system is very simple, and involves few parts. The major part is the star-wheel, located in the lower left corner of receiver. Upon bolt recoil, the star-wheel is rotated for one step by the interaction of the cam surfaces on the bolt and the wheel. Each cartridge has to make three steps in the feed before being presented to the bolt for chambering, therefore initial belt loading requires three deliberate pulls on the charging handle. The feed direction is from the right side only, ejection being to the left.
The trigger system also is of rather simply design. It involves a separate striker, a striker spring and a sear, mounted on the bolt. The sear is cocked by a lever attached to the rear bolt delaying strut, and this cocking movement adds to the retarding force applied to the bolt. After cocking the striker is held to the rear by the sear. The thumb trigger is located at the rear of the receiver, and once pushed by the operator, it holds the connection bar so it trips the sear when the bolt is in battery. A manual safety is located next to the trigger and blocks it unless pushed forward by the operator’s left thumb. Dual spade grips are located horizontally at either side of the receiver, and can be folded up for storage or transportation.
The most common mounting was a tripod of solid construction, with tubular legs of adjustable height and traverse and elevation mechanisms. An optional armored shield was available for this gun, which was unusual in that it also provided frontal and lateral armored protection for the thin metal of the water jacket. Alternatively, a low-height, lightweight tripod was provided for the “light” role. This tripod had no traverse and elevation mechanisms.