KS-19

100 mm air defense gun KS-19
KS-19 in Saint Petersburg Artillery Museum.
Type	Air defense gun
Place of origin	Soviet Union
Service history
Wars	Korean war Vietnam war
Production history
Designer	L. V. Lulyev
Specifications
Weight	9,550 kg (21,054 lbs)
Length	9.45 m (31 ft)
Width	2.35 m (7 ft 8 in)
Height	1.60 m (5 ft 3 in)
Crew	15
Shell	100×695 mm. R
Caliber	100 mm (3.94 in)
Elevation	−3°/+85
Traverse	360°
Rate of fire	15 rounds per minute
Muzzle velocity	900-1,000 m/s
Maximum firing range	Horizontal: 21 km (13 mi) Vertical: 12,700 m (41,667 ft) timed fuse. 15,000 m (49,213 ft) proximity fuse.

100 mm air defense gun KS-19 (Russian: 100-мм зенитная пушка КС-19) was a Soviet anti-aircraft gun. Following the end of the Second World War the Soviet Union introduced into service the 100 mm KS-19 and 130 mm KS-30.

The KS-19 is a heavy towed anti aircraft gun that has largely disappeared from front line arsenals due to increased use of more effective surface-to-air missiles. Being a towed weapon an external form of mobility was required, usually an AT-S Medium or AT-T Heavy tracked artillery tractor. The 15 man crew were carried on the tractor along with ready use ammunition for the gun. Ammunition was loaded as a single round into the loading tray and a well trained crew could fire 15 rounds maximum per minute.

Anti Aircraft ammunition includes high explosive, high explosive fragmentation and fragmentation types. The KS-19's onboard sights can be used to engage air targets; however increased accuracy was achieved if used in conjunction with a fire control radar such as the SON 9 (NATO Reporting name 'Fire Can') and PUAZO-6/19 director.

As the KS-19 is a heavy calibre Anti-Aircraft gun it also has some utility in the ground role especially against armored targets. As a result of this two armor piecing rounds were produced: the AP-T (Armour Piercing-Tracer) and APC-T (Armour Piercing Capped-Tracer) with the AP-T round reportedly able to penetrate 185 mm of armor at 1000 m.

The KS-19 was used in action by communist forces in both Korea and Vietnam.

Recently Iran has built an upgraded automatic version of KS-19 named Sa'ir.