Back in the '80s, the gun shop where I worked whilst not in school had a Valmet, an IMI Galil, and some sort of Chinese .223, probably Polytech as the mag well is more 7,62 sized. We swapped action parts about willy nilly and everything worked fine. Haven't seen an IMI import in ages, but the Valmets and various Chines .223s show up locally fairly often still.