Also I wish to pay attention of developers to earlier modernizations MTLB.
Here on this site it is written about an exhibition in city Pskov (last paragraph and a photo):
"The exhibit shown in Pskov «exhibitions for minister» could serve if not as reproach, an occasion for reflections of experts of our defend industry. It is clear, that in conditions of problems with financing it is difficult to expect, that the army can buy new armory machines firing supports. As an example of such machine 12,7 mm machine gun NSV and coupled gun GSh-2-23 (ZU-23/2S AA-Gun)." can serve MT-LBM-6M3, having electricengine a tower with automatic grenade launcher AGS-17,"
in () - my writen.
MTLB-6M3
http://pvo.guns.ru/zu23/zu23_pskov.htm
Source of information for 2003.
And here MTLB already in the Chechen Republic of 1999-2000 (the second photo):
http://pvo.guns.ru/zu23/zu23_chechnya.htm
Also on a photo it is visible that ZU--23/2s AA-Gun was put and on lorries.