5203rd Weapons and Equipment Storage Base (1989–1993) 511th Motor Rifle Regiment (1993–1996) 4th Separate Motor Rifle Brigade (1996–2004) The 4th Separate Mechanized Brigade named for Hero K. Kaysanov (Kazakh: 4-шi жеке механикаландырылған бригадасы (4-ші жмехбр); Military Unit Number 27943) is a motorized infantry brigade of the Kazakh Ground Forces.

The brigade traces its origins back to the Soviet 155th Motor Rifle Division, formed in 1970 in Semipalatinsk.

[1] In 1993, the 5203rd Weapons and Equipment Storage Base became the 511th Motor Rifle Regiment.

In April 1970, the 155th Motor Rifle Division was activated in Semipalatinsk, subordinated to the 1st Army Corps.

On 1 December 1998, the regiment was reorganized as the 4th Separate Motor Rifle Brigade.