The AKS-74U was basically a second go at the AKMSU in the new 5.45x39mm chambering. This time, the lower-recoil nature of the smaller round made the project a success. The AKS-74U featured a 8” barrel (exactly half the length of the standard, rifle-length AK barrels) and the same hinging receiver cover as the AKMSU. The proprietary furniture also made a second appearance, and the underfolding stock was replaced with the side-folding model from the AKS-74 (and later models had the rear trunnion switched to accept ‘74M stocks). The AKS-74U also features a unique muzzle booster that would direct more gasses back into the weapon, improving its ability to cycle. This did produce more recoil than if a standard gas system were to be used, but not a hugely noticeable amount. That said, even though the lighter round was being used, the AKS-74U still had a fair amount of recoil to it, and it was very loud thanks to its short barrel and muzzle device. Because of these traits, the Russians often times refer to it simply as the “сучка” or “cyka” (pronounced “sushka” or “suka”) or “[little] bitch”.