Automatic firearm breech mechanism

A firearm breech mechanism, comprising:

• a delaying roller configured to move in a working area;
• and
• a cage surrounding the working area of the delaying roller, wherein
• the cage prevents the delaying roller from falling out when the firearm is disassembled,
• the cage comprises a bent strip in a shape of an inverted letter “U”,
• the bent strip comprises a horizontal wall and two vertical walls,
• the horizontal wall comprises an opening,
• each of the vertical walls are fitted with a slide stop at both ends, and
• a width of the opening is smaller than a diameter of the delaying roller.

A firearm breech mechanism, comprising:

• a breech comprising a rear wall;
• a breech carrier comprising a front wall;
• a delaying roller positioned between the rear wall of the breech and the front wall of the breech carrier, the delaying roller configured to move in a working area;
• and
• a cage surrounding the working area of the delaying roller, the cage comprising a bent strip in a shape of an inverted letter “U”, wherein
• the bent strip comprises a horizontal wall and two vertical walls,
• the horizontal wall comprises an opening,
• each of the vertical walls are fitted with a slide stop at both ends, and
• a width of the opening is smaller than a diameter of the delaying roller.