what is the bulgarian U-5TC ( Large calibre artillery systems) ?

[Anas Ali]

al salam alikoum
i found on the un-register the Egypt bought 3 U-5TC ( Large calibre artillery systems) on 1999 i searched about that type of weaponry but no luck what it is
so i hope you guy could help me to identify what it is

 

[Anas Ali]

?

 

[JinRoh]

Checked the Internet and U-5TC is only mentioned in the UN Register. Jane's Armor and Artillery also has no system with the name U-5TC. The closest match being U-5TS the 115mm smooth bore gun of the T-62 tank. Initially I thought these could be ordered for Egyptian T-62s (evaluation for a refurbishment or upgrade) but according to Wikipedia in the mid 1990s Egypt replaced U-5TS with 105mm M68. So no success.