The Bulgarian AKS-74U, or colloquially known as the “krinkov” is a compact assault rifle based on the Kalashnikov series of AKM / AK-74 rifles. It is a side folding stock variant of the AK-74 and has most of the same features. The AKS-74U is considered by many to be a submachine gun, though it is chambered in an intermediate cartridge. It started production in the early 1970s. The AKS-74U has a 206.5 mm barrel and a stamped sheet metal folding stock for easy transport and maneuverability in tight spaces.

The Bulgarian AKS-74U can be identified by markings on the left side of the rifle's front barrel trunnion. It has a distinct circle "10" marking on the side of the trunnion, indicating it as a Bulgarian built firearm. It also has a date of manufacture and a unique serial number, which can be found on various parts of the rifle. Bulgarian AKS-74Us have a painted black finish, and a unique folding top cover, with flip rear sights which have a “battle” zero (300m) and a setting for 400-500 meters.

The Bulgarian AKS-74U has some unique design features, such as a stamped sheet metal folding stock in line with the rest of the rifle, a ribbed sheet metal dust cover, and a pair of wood handguards. Later models after the fall of the Soviet Union feature plastic handguards. The Bulgarian AKS-74U operates with a manual of arms comparable to a standard Kalashnikov assault rifle.