I'm predicting the purpose of this weapon is not to suppress an enemy, as it is NOT a true machine gun capable of such feat.
Rather, this weapon was probably devised to be used in a heavily urban environment by a special forces team in order to defeat targets at close range (up to 600 yards I'm guessing) that are entrenched behind a hard barrier of sorts, and/or armoured vehicles. It seems no different than the American 50cal Barrett except this Russian weapon sports 4 more rounds and an integral suppressor,......and full auto.
I don't think this weapon could ever be used in the army, at any level. It doesn't have volume like GPMG's, most likely too heavy for one soldier to use and carry a tactical amount of ammo for, the squads already have a bunch of GP-30 GL's and a rocket launcher or two for defeating hard barriers. This 50 cal auto rifle just doesn't fit anywhere else.