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The AK-74 stripped down to its major components. The rifle's operation during firing and reloading is identical to that of the AKM. After ignition of the cartridge primer and propellant, rapidly expanding propellant gases are diverted into the gas cylinder above the barrel through a vent near the muzzle. The build-up of gases inside the gas cylinder drives the long-stroke piston and bolt carrier rearward and a cam guide machined into the underside of the bolt carrier along with an ejector spur on the bolt carrier rail guide, rotates the bolt approximately 35° and unlocks it from the barrel extension via a camming pin on the bolt.

The moving assembly has about 5.5 mm (0.2 in) of free travel which creates a delay between the initial recoil impulse of the piston and the bolt unlocking sequence, allowing gas pressures to drop to a safe level before the seal between the chamber and the bolt is broken. Like previous Kalashnikov-pattern rifles, the AK-74 does not have a gas valve; excess gases are ventilated through a series of radial ports in the gas cylinder. Since the Kalashnikov operating system offers no primary extraction upon bolt rotation, the 5.45×39mm AK-74 bolt has a larger extractor claw than the 7.62×39mm AKM for increased extraction reliability.

Other minor modifications were made to the bolt and carrier assembly. 1P29 Universal sight for the AK-74 and other small arms While most Russian and armed forces use the iron sights on the AK-74, many magnifying and non magnifying optical sights are available for designated marksman, and other special purpose troops in their respective militaries. For the 5.45×39mm AK-74, the East German Zeiss ZFK 4×25, 1P29, Belorussian PO 3.5×21P, PO 4×24P and the 1P78 Kashtan dedicated side rail mounted optical sights were developed. These optical sights are primarily designed for rapid target acquisition and first round hits out to 400 m, but by various means these optical sights also offer (BDC) (sometimes referred to as ) for aiming at more distant targets. The BDC feature compensates for the effect of on the at given distances (referred to as ') in flat fire scenarios. The feature must be tuned for the particular ballistic trajectory of a particular combination of gun and at a predefined and.