CASE FOR FIREARMS (VERSIONS) Russian patent published in 2017 - IPC F42B5/26 

FIELD: weapons and ammunition.

SUBSTANCE: group of inventions relates to ammunition, particularly to the firearm cartridge cases. The case for small firearms is made of plastic. The case consists of a body and a base with a primer-igniter. Inside the case body a Laval nozzle is embedded, arranged in the form of two truncated cones coupled with narrow ends. In another embodiment, the case for small firearms is made of metal. An insert is embedded inside the case body, the inner side of which is shaped as a Laval nozzle arranged in the form of two truncated cones coupled with narrow ends.

EFFECT: invention provides increasing in the initial velocity of the ammunition during firing.

13 cl, 6 dwg