The AK-74 is an adaptation of the 7.62×39mm AKM assault rifle and features several important design improvements.[12] These improvements were primarily the result of converting the rifle to the intermediate-caliber high velocity 5.45×39mm cartridge, in fact, some early models are reported to have been converted AKMs, re-barreled to 5.45×39mm.[16] Compared to the preceding AKM the AK-74 has better effective range, firing accuracy (a main development goal) and reliability. The AK-74 and AKM share an approximate 50% parts commonality (interchangeable most often are pins, springs and screws)