This is 7.62x39 Brown Bear 123gr. Polymer Full Metal Jacket Ammo. This ammo is manufactured by JSC Barnaul Machine-Tool Plant in Russia. Barnaul is considered to be the premier ammunition factory in Russia, and it supplies most of the ammo to the Russian Military. This ammo has the polymer coated steel case and is ammo is 100% non-corrosive and the primer is sealed for moisture protection. The polymer coating on ammo makes the case smoother resulting in better feeding and extraction. Additionally, polymer coated ammo is both lighter and more waterproof. It comes packed in 20rd boxes, 500rds. per case.