The AKS-74UB is one of the rarer Kalashnikov variants, a suppressed short carbine designed for missions requiring minimal noise and visual signature. Derived from the AKS-74U developed by Mikhail T. Kalashnikov in the 1970s, the AKS-74UB was created by a team of engineers at the Research Institute-61 (NII-61, now TsNIITOCHMASH Central Research Institute of Precision Engineering) using the AKS-74U as the base, a mass-produced weapon adapted into a small-production-run specialist tool for clandestine and close-quarters use. The AK-74UB was designed as a dedicated suppressed version of the AKS-74U; as such, it was assigned the GRAU index 6P27.
The Soviet “Silent” AKS-74UB
AKS-74UB and AKS-74U at the Museum of Artillery, Engineers, and Signal Corps in St. Petersburg, Russia. By Lynndon Schooler.
Standard AKS-74U. By Lynndon Schooler.
The Gun
The AKS-74UB is a shortened suppressed carbine; the “U” denotes “short,” and “B” for “silence.” The carbine accepts the PBS-4 suppressor, a purpose-built device that, with subsonic ammunition, reduces muzzle blast and flash, making firing less conspicuous in confined, close-quarters spaces, urban environments, and particularly for covert operations behind enemy lines.
AKS-74UB with 30 mm silent grenade launcher “Canary” 6G17. It accommodates both subsonic 5.45 mm and subsonic 30mm grenades. By Lynndon Schooler.
Ammunition
To achieve the desired sound reduction, the AKS-74UB was paired with the 7U1 low-velocity 5.45x39mm subsonic cartridge. Subsonic rounds eliminate the supersonic crack but have a lower muzzle energy and barrel gas pressure. The special 7U1 ammunition had a relatively weak powder charge, so the rifle had to be cycled manually for subsonic rounds and was reportedly very quiet, potentially eliminating the weapon's mechanical report and retaining the spent casing. Because it is typically manually operated, an extended charging handle was added. The AKS-74UB reportedly also featured a plunger-type ejector on the bolt, intended to facilitate ejection of low-power subsonic rounds that would otherwise short-stroke because the bolt would not cycle fully rearward. The 7U1 ammunition was loaded with tungsten-cored bullets, increasing its weight to about 78 grains and achieving a muzzle velocity of about 84 fps. This may have led to stabilization issues at longer ranges, which is why it was only designed for very close range, well within 100 meters. The design of the PBS-4 suppressor permitted standard supersonic 5.45 mm 7N6 ammunition. A special rear sight had two adjustable blades for subsonic and standard ammunition, similar to the PBS-1 rear sight.
PBS-4 suppressor and the unique “Canary” 30 mm captive piston grenade launcher. By Lynndon Schooler.
Deployment
Because of its highly specialized role and specialized cartridges, the AKS-74UB was never produced or issued at scale. It was fielded in very small numbers to units capable of exploiting the weapon: Spetsnaz teams and reconnaissance detachments that required a highly portable, low-signature weapon for highly specialized tasks. This was designed to operate behind the lines or in areas requiring silence, such as eliminating sentries. In reality, this special weapon was developed as a last resort; the key was to prevent detection. If you had to use the weapon, something had already gone wrong with the operation; however, if the user had to use their weapon, they had options, using subsonic ammunition or switching to standard supersonic ammunition. The AKS-74UB reportedly first saw use with Soviet special operations in the Soviet-Afghan War (1979-1989). The numbers manufactured, or their effectiveness, remain unknown to the public.
Special-purpose weapons for Soviet Reconnaissance and Spetsnaz units. The APB, “Tishina,” and “Canary” noiseless grenade launcher systems. By Lynndon Schooler.
The AKS-74UB was fitted with 20-round polymer magazines to reduce bulk and improve concealment; issuing the carbine with the shorter magazines also served to distinguish it from the standard 30-round magazines, as the weapon was intended for use with special subsonic ammunition and standard service rounds.
20-round 5.45 magazine for the AKS-74UB compact silent assault rifle. By Lynndon Schooler.
Legacy
The AKS-74UB is rare not because it was a failure, but because it was built for a very narrow job. At its core, it remains a straightforward Kalashnikov, simple, tough, and familiar in its manual of arms. Still, the UB variant shifted the design, prioritizing suppression and compact size over overall performance. Adding a suppressor, relying on subsonic ammunition, and experimenting with smaller magazines gave it real advantages in certain situations. However, the AKS-74UB was rapidly replaced in the mid-to-late 1980s by newer designs such as the VSS and the AS Val, as developers pursued a new concept, perhaps a counterintuitive combination of subsonic performance and armor-piercing capability.
The AKS-74UB caught my attention because of its role as a specialized weapon. The museum examples and photographs help reconstruct its small but intriguing contribution to late Cold War special weapons development and programs. Above all, the UB serves as a reminder that the pursuit of silence and portability requires trade-offs; even the famously rugged Kalashnikov platform reveals limits when adapted to niche clandestine roles. Still, many militaries and organizations today pursue similar design concepts.
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