The Nora B-52 is a 155 mm self-propelled howitzer developed by Military Technical Institute and manufactured by Yugoimport SDPR in Velika Plana, Serbia.
Serbian Nora B-52 M15
Nora B-52 K1 of Bangladesh Army
MGS-25 Aleksandar
155 mm is a NATO-standard artillery shell caliber that is used in many field guns, howitzers, and gun-howitzers. It is defined in AOP-29 part 1 with reference to STANAG 4425.
M107, M795, M483A1 155 mm projectiles
M107 projectile 155 mm projectile being loaded into an M777 howitzer