Someone PMed me suggesting they are starter pistols (track and field).
I’ve never seen an automatic starter pistol. They are usually revolvers like this:
https://www.youtube.com/watch?v=rdkFHfjvfCY
But apparently they exist:
http://www.amazon.com/s?rh=n%3A3420881%2Cp_n_feature_keywords_browse-bin%3A4822415011
But for some reason.... I doubt these city thugs are out running track.
Never heard of an automatic starter pistol either.