Device for quickly replacing a magazine

A device for quickly replacing a magazine of handheld automatic small arms of a bullpup configuration, for storing a spare magazine and installing it in place of a service magazine, consisting of:

• housing of the device, in the butt of the arm comprising:
• pivoting tray with spring-loaded guides;
• spring of the pivoting tray;
• spring-loaded latch of the pivoting tray;
• drive of the spring-loaded latch of the pivoting tray;
• a spare magazine that is coupled to the pivoting tray and adapted to hold the magazine by way of the spring-loaded guides and wherein comprising:
• a plurality of guide grooves adapted for moving the spare magazine;
• a ridge with grooves on the magazine configured to interact with the spring-loaded guide;
• a ridge on the magazine for moving the magazine along the grooves;
• a service magazine that is coupled to the housing and wherein comprising:
• a plurality of grooves adapted for moving the service magazine;
• a lock configured to hold the service magazine;
• a spring adapted for removing the service magazine;
• a ridge or groove on the magazine configured to fix the service magazine;
• device control key comprising:
• return spring adapted to return the device control key in the original position.