The 10 cm Feldhaubitze M 99 was a howitzer used by Austria-Hungary during World War I.

10 cm Feldhaubitze M 99
10 cm M. 99 Feldhaubitze in the HGM, Vienna
Type	Field howitzer
Place of origin	Austria-Hungary
Service history
In service	1903-1918
Used by	Austria-Hungary
Wars	World War I
Production history
Designed	1899-1902
Specifications
Mass	997 kg (2,198 lb)
Barrel length	1.35 m (4 ft 5 in) L/13
Width	1.56 metres (5 ft 1 in)
Shell	14.3 kilograms (32 lb)
Caliber	104 millimetres (4.1 in)
Breech	eccentric interrupted screw
Carriage	box trail
Muzzle velocity	305 m/s (1,000 ft/s)
Maximum firing range	6,100 m (6,700 yd)

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It had a barrel from the so-called steel bronze (92% copper bronze strengthened by autofrettage which was used due to the lack of steel industry in Austria, see Franz von Uchatius), and lacked a modern recoil system, using only an ineffective spring-mounted spade brake, so was virtually obsolescent on its introduction. Nonetheless, it was the standard field howitzer for the Austrian Army at the outbreak of the war.

It donated its barrel to the 10 cm Gebirgshaubitze M 99, although few of those were made, being largely replaced by a version of the standard Feldhaubitze M 99 with a narrow, 1.3 metres (51 in) carriage for use on mountain paths. The axle seats were deleted from these narrow carriages in the interest of saving weight.