The Krinkov has incredibly high base damage for an SMG, on par with the Swedish K. It also has a good variety of mods, an ample magazine size, and good accuracy. However, it severely lacks in both total ammo and stability. With the right mods, it can make a useful "pocket AK.762", albeit with a much higher fire rate, and lower accuracy, stability, and modability. As a matter of fact, due to this high base damage and accuracy, but low ammo and stability, it is one of the few -- if not the only -- SMG where the single-fire mod is viable.
However, it has a major flaw in its low amount of total ammo; it only has three full magazines' worth of ammo before running out. It also has some of the worst recoil of all the submachine guns, only beaten out by the Mark 10.
To get the most out of the low reserve ammo, it is recommended that one increase the already high damage of the Krinkov and to always go for head shots, unless in an emergency. For longer ranges, one should try to burst fire to keep the recoil in check and save ammo, or use semi-auto mode.
It is a viable secondary weapon for Plan A, due to its high concealment, and its massive damage makes Plan B a good choice too.
The Krinkov is based on the AKMSU, as indicated by its internal name in the weapon asset files and the AKMS's ribbed cover. However, the AKMSU is a term given to an AKM rifle that was modified after purchase, and as such was never an officially produced rifle by Izhmash on it's own. This may imply that the Krinkov in-game may be either a custom AKM, or 7.62x39mm variant of the AKS-74U carbine produced by another Eastern european country, potentially a Serbian Zastava M92. An equally likely explanation may be that the in-game weapon may have been a domestically sold 7.62x39mm pistol that has been illegally modified for select-fire capability and rifle stocks.
"Krinkov" is a nickname of (presumable) Middle-Eastern origin used to call the AKS-74U in the United States. This term is now commonly used as a slang name to identify all shortened AK variants.
Despite being a carbine, it is noted as a sub-machine gun in-game alongside the Para.