The G3 is a selective-fire automatic weapon that employs a roller-delayed blowback operating system.
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Αδράνεια ελατήρια κύλινδρακια
Έτσι έγραφε και ένα καδρο προσπέκτους που θυμάμαι στον στρατό
Προφανώς και υπάρχουν αέρια η πίεση οπως θες το λες για να αρχίσει η κίνηση του κλείστρου αλλά αυτό δεν το κάνει gas operated
Operation
Roller retraded blowback by grasyl
Diagram: HK G3 operation cycle
When the rifle is fired, the pressure begins to move the cartridge back against the bolt face. The rollers, which are extended into the recesses in the barrel extension, began to move inward into the bolt head, due to inclined shape of the recesses. This movement translates into the faster rearward movement of the heavier bolt body, so at the initial moments of the shot, when pressure in the chamber is still high, the bolt face moves relatively slow.
When the pressure drops to a reasonable level, the rollers disengage the barrel extension completely and the bolt head and the bolt body move backward at the same speed, extracting and ejecting the spent case and chambering a fresh cartridge on the way back.