Nora B - 52 The Nora B - 52 is a 155 mm / 52 - calibre self - propelled howitzer , 4 generation artillery weapon system developed by Vojnotehnički Institut ( Military Technical Institute MTI ) in Belgrade , Serbia , for export and domestic use . The first self - propelled Nora B ( developed on basis of Nora C ) was designed by MTI in 1984 ( in that time no other country except SFRY had that kind of weapon today known with acronym TMG - Truck Mounted Gun ) with a modified 152 mm towed gun - howitzer NORA M84 with 45 caliber gun mounted on an FAP 8x8 truck bed and was 3 generation of artillery weapons . Later after 2000 MTI developed new versions 4 generation artillery systems with 52 caliber 155 mm gun for fitting on a new system of NORA family with B - 52 designation . Variants . B - 52 operation depending on version is fully automated , including a 36 - round autoloader . It is made in several versions : 1 . K0 ( first serial variant , open turret , manual power drive and light of sight ) 3 . K1 ( S ) ( differences from K0 : semi - open turret , full automatic , independent automatic navigation , automatic fire and control system , smaller crew number ) 4 . M03 ( semi - open turret , automatic based on K0 , K1 designs with S designation for Serbia Army ) 5 . KE ( semi - open turret , full automatic export variant ) 5 . K - I ( K1 with additional armored full automatic with closed turret , new stronger chassis , radar on barrel for measuring projectile trajectory and speed , NBC protected cabin and turret , automated fire - suspension system , smoke grenade launcher , intercom for crew and new software ) designated S for Serbia 6 . Newest in development K2 ( 25 liter chamber , higher rate of fire , laser guided long range ammunition , smaller crew , new automated functions , smaller weight ~ 25 tonnes , automatic leveling of gun in north direction , new smoke and light grenade ) . K designation stands for Kamaz chassis , number for orientation of main weapon in relationship to north and letter for level of equipment and / or export designation . It is possible on demand to equip Nora B - 52 howitzer with 152 mm gun . All versions have differences in chassis , armour , turret , loading and support system . All versions with automatic loader features MRSI capability . Standard equipment includes a computerized fire control system and a land navigation system . Ballistic protection is provided against small arms fire , shell splinters and some mines . Operators . Serbia has exported the Nora B - 52 artillery battlefield systems ( included in system : B - 52 selected versions of self - propelled howitzer ( K1 , KE , KI ) , reconnaissance BOV M11 , command ( BOV M10 ) and battery fire control and meteorological vehicles , ammunition loading trucks , artillery battlefield software for platoon , battery and division level ) to the armed forces of Myanmar , Kenya and Bangladesh . One fully equipped battery usually consist of 6 - 12 self - propelled howitzer , reconnaissance 1 - 2 BOV M11 , 3 command BOV M10 ( 1 for each platoon and 1 for battery cmd . ) , 3 - 6 Munition trucks , communication and workshop vehicle , 2 - 3 general supply vehicles ( fuel , food , water etc ) and 1 - 2 fire direction and gunfire locator vehicle with radar and sound ranging .