Really, what are the advantages? Of course, yeah, it looks cool and the authenticity is nice to a degree, but at that point the practical differences end. Buying a pistol with blowback seems like a good way to pay more for something that you really don't need to pay much money for. Are there any correlations between gas blowback and performance? Do the mechanics just have this tendency to be really high quality? Or is it just coolness and vanity that people are looking for when they get one?