Western is a Mexican pellet gun, a pistol that shots hollow point pellets Mendoza 2000 Express propelled by .22 blank cartridges, is a single shot weapon half cocked secure, same pistol as PK-62-L only aesthetic changes.

The munisalvas are a system of ammunition considered as an air weapon. It was invented in Mexico in the 60s. They are known as munisalvas because when this system was invented, a lead post or BB was used as a projectile, which is also known as "ammunition". Therefore, the prefix "muni" of ammunition was used, attached to the word salva. (ammunition + salvo = munisalva).

The system was invented by Mr. Alfonso Ruiz Cabañas in the 1960s. After several attempts and investigations, he had discovered that combining a salvo and a 4.5 mm caliber lead ammunition achieved great results in accuracy and power. Basically, a new category had been created among the most powerful air rifles.

Translated from Spanish Wikipedia: https://es.wikipedia.org/wiki/Munisalva