sentences:  It was replaced in Soviet/Russian inventory by the 2A36 Giatsint-B and the self-propelled 2S5 Giatsint-S. Several companies, like Soltam and RDM Technology BV, have presented upgrade packages for the gun.These include, for instance, an upgrade to a 45 caliber 155 mm gun.The M-46 saw extensive combat service with the People's Armed Forces for the Liberation of Angola (FAPLA) during the Angolan Civil War and South African Border War.