Around 1991 the Russians developed a slight variant of the SVU, the SVU-A. Whereas the SVU is semi-automatic, the SVU-A (the A stands for automatic) is a fully automatic rifle.
Around 1991 the Russians developed a slight variant of the OTs-03, the OTs-03A (SVU-A). Where as the SVU is semi-automatic, the SVU-A (the A stands for automatic) is a fully automatic rifle.