They sure do look like Slavia's although I am sure the others are right and I've heard of the brand before. Very agricultural, typical Cold War European fare. That said, also built like little tanks. Does it have an adjustable trigger or is it direct sear? These little guns can be surprisingly good shooters and lots of fun, indoors and out. Show us some pictures of your guns, especially the underlevers. I will bet those might be Relums.