AN-94 is an assault rifle of Russian design chambered in 5.45 caliber. It is claimed to be state-of-art in Russian small arms development.
The most important design differences (relative to common designs like AKM) include:
- Internal receiver, chamber, bolt, bolt carrier, barrel and gas tube/piston are all integrated into one independent assembly - called firing unit.
- Stock, external receiver form what is called "Effect Envelope" and firing unit can move along the barrel axis relative to this envelope - which is supposed to increase accuracy by delaying recoil until the second round is fired.
- The firing unit includes a rammer connected to the bolt carrier by a cable and pulley system. The rammer is moving forward as the bolt moves backwards, to accomodate for pre-feeding sequence, by stripping the next round from the magazine and moving it just in behind the chamber, where it's being subsequently fed by returning bolt.
The gun specification claims that when firing full-auto the first two rounds are being fired at 1800 rpm speed, but all subsequent ones at 600 rpm. Why is the time between the first two shots shorter? I can't find anything that would differentiate between the first two and all the subsequent rounds? I would understand if the gun was either keeping the same cyclic rate or rather shoot in a continuous stream of two-round bursts with mean rate of 600rpm but neither is the case. Can someone explain this to me please?