Munisalva

Munisalva refers to the combination of a 6 mm Flobert blank cartridge and a .177 or 4.5 mm caliber [airgun projectile]. Munisalva word comes from Spanish "Muni" and "salva", so the word munisalva can be translated into English as BBlank.
This projectile system had its beginnings in 1949, when Alfonso Ruiz Cabañas began to venture into the manufacture of sporting rifles. After several investigations, he noticed that by combining a 6 mm Flobert blank with a 4.5 mm caliber projectile, high shooting speeds were obtained without the recoil that a traditional spring air rifle would bring.
Blak/BB weapons are not considered firearms under Mexican law and according to Article 13 of the Federal Law on Firearms and Explosives, among the reasons why they are not considered firearms are the fact that the projectile is separated from the warhead, its low impact energy and that they do not use gunpowder, since their power comes from the priming compound.
The commercial models of weapons designed to fire munisalva are the Mendoza PK-62 and Cabañas P-8 pistols, as well as the Mendoza M-990 and Cabañas RC-30 rifles.