‘VG 1-5’ means VG 1 through 5 (1, 2, 3, 4, and 5.) The Volkssturmgewehr were five different weapon designs, one of which is in the game already (the ‘VG. 2’.)
“The weapon is also sometimes known as the “Volkssturmgewehr 1-5” (or “VG 1-5”), a name that was believed to have originated as a misnomer. The Primitiv-Waffen-Programm resulted in five other bolt action rifle designs, VG 1 from Walther (VG in these cases standing for Volksgewehr), VG 2 from Spreewerk Berlin, VG 3 from Rheinmetall, VG 4 from Mauser, and VG 5 from Steyr. Collectively, they become VG 1-5, and a few misconceptions later the name was stuck to the Gustloff weapon.”
508 was also automatic , only handful of them were made and none survived but there are documents that show them existed like how there are document showing that FG42 chambered for 8mm kurz existed