The item in the Kvar picture and the Tactical Accessories picture look different to me.
On the Kvar item, the flash hider cuts are rounded on the front. On the TA item, they are pointed. On the Kvar item, the rear of the flash hider cut extends all the way to the major diameter. On the TA item, the cuts stop just short of the major diameter.
While they certainly do look nice, this would suggest that the bulgarians changed the design a bit, or, those are not bulgarian.