"armament factory" is correct and can be used in written English.
You can use it when referring to a factory which manufactures weapons and military equipment. For example, "The armament factory was the first to receive the new shipment of AK-47s."
You're right to say Arsenal aren't named after a geographical location: the club began life in Woolwich, south-east London, as the team of the local Royal Arsenal armament factory.
An engineer by profession, Ustinov graduated in 1934 from the Military Institute of Mechanics in Leningrad (now St . Petersburg and worked first as a construction engineer, then as director of a Leningrad armament factory.
"To begin with I did it for fun and to make extra money and because people need innovative low-cost options in a bad economy," said Mikio, a wiry and jovial man who heralded each new course by ringing a loud bell made of metal from his family's armament factory back in Japan.
One evening soon after his appointment, Speer went to visit a Berlin armament factory; he found no one on the premises.
In late 1938, another Panzer I was sent to the Armament Factory of Seville in order to mount a 45 mm gun, captured from a Soviet tank (a T-26 or BT-5).
Four of these tanks were finished at the Armament Factory of Seville, but further production was canceled as it was decided sufficient numbers of Republican T-26 tanks had been captured to fulfill the Nationalist leadership's request for more lethal tanks.
As we reported earlier this year, Serbia is interested in selling arms and building armament factories and military hospitals in the region.
As the commercial hub of the industrial Meuse Valley, Liège developed iron and steel foundries, glassworks, coal mines, armament factories, and copper refineries.
Another problem were the 305 mm guns and turrets as the armament factories were focused on the higher-priority guns for the Sovetsky Soyuz-class battleships.
Because Buchenwald was a forced labor camp, the German authorities had intended to put the 168 airmen to work as slave-labor in the nearby armament factories.
Rather than increasing female labor and taking other steps to better organize German labor, as Speer favored, Sauckel advocated importing labor from the occupied nations – and did so, obtaining workers for (among other things) Speer's armament factories, using the most brutal methods.
