the info on brownings web page implies 2 mags:
Features - Extra magazine
as for sights its a matter of personal taste. i dont like adjustable sights more parts to break and they get snagged.
if i was going to buy a 9mm it would be a cz75. even tho john browning designed the hi-power the cz75 is a better pistol.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith