Blow back charging handle for 9mm pcc?

[gun'sRgood]

I got to shoot a FA 9mm PCC for about two minutes in las vegas. Now Im wondering what I may have shot. Do they use a blow back charging handle, like Gasbuster's? Also do they use a short stroke bolt? It seems to my ignorant eye that both would make sense? It amazes me how much happens in such a short time!