Arrangement for weapon

Abstract

An arrangement for a weapon including a countermass for reducing the pressure around the weapon. The countermass is enclosed in a container, which is mountable in the barrel of the weapon behind an ammunition part. The container is provided with an openable bottom with break indications. A guiding folding support, configured as an annular element, is arranged adjacent to the openable bottom on the outside of the bottom relative to the countermass container. The annular element is provided with a support member for each openable flap forming part of the bottom. Thereby, the opening area in the bottom of the counter mass container is defined by folding edges, formed in each base region of the flaps in the open state as in contact with its corresponding support member.

1 . An arrangement for a weapon, comprising:
 a countermass for reducing the pressure around the weapon,   a container enclosing the countermass, which is mountable in a barrel of the weapon behind an ammunition part, the container comprising an openable cover with break indications on an ammunition part side and an openable bottom with break indications on an other side, and   a guiding folding support arranged adjacent to said openable bottom on the outside of the bottom relative to the countermass container.   
     
     
         2 . An arrangement according to  claim 1 , wherein the guiding folding support comprises an annular element configured to fit tightly against an outside of the countermass container and in agreement with the break indications of the openable bottom. 
     
     
         3 . An arrangement according to  claim 2 , wherein the openable bottom comprises a number of openable flaps, and wherein said annular element comprises a support member for each openable flap forming part of the bottom. 
     
     
         4 . An arrangement according to  claim 3 , wherein the openable bottom comprises at least four radially extending break indications defining at least four openable flaps for interaction with corresponding support members of the annular element. 
     
     
         5 . An arrangement according to  claim 2 , wherein the annular element is arranged at one end of a sleeve, which is arranged to interact between the countermass container and the barrel. 
     
     
         6 . An arrangement according to  claim 4 , wherein each openable flap is triangular, and wherein in the open state is configured with free equilateral legs and a base region integral with the wall of the countermass container. 
     
     
         7 . An arrangement according to  claim 6 , wherein an opening area in the bottom of the counter mass container is defined by folding edges formed in each base region of the flaps in the open state as in contact with a corresponding support member. 
     
     
         8 . An arrangement according to  claim 5 , wherein the sleeve is configured for modification of a caliber of the barrel. 
     
     
         9 . An arrangement according to  claim 5 , wherein the sleeve including the annular element comprises a material having an ultimate breaking strength larger than an ultimate breaking strength of a material of the barrel at operating pressure. 
     
     
         10 . An arrangement according to  claim 3 , wherein each support member comprises a straight folding line comprising a chord of the annular element.