GFL is Fiocchi. Case appears to be NATO spec 1984 manufacture.
Not sure on PG at the moment.
The far right :
Prvi Partizan-Namenska Proizvodnja, Titovo, Uzice 31000, Yugoslavia. These are actually Cyrillic letters equal to "PPU in the Western alphabet.
The one in the middle was made by Pobjeda in Goražde, Bosnia and Herzegovina. I think this was their first headstamp style introduced about 2002 by UNIS-Pobjeda.