mbl said
Except for that one moment where the dude running out of ammo saves the MC's life
They have an entire trope dedicated to that, if I recall correctly, where a gun never runs out of ammunition before it becomes plot convenient.
EDIT: A ha!
" Bottomless Magazines: In the manga Kiriyama only changes magazine once and fires hundred of rounds.
Averted by anyone who isn't Kiriyama.
In the novel it's justified since he changes weapons and steals his victim's weapon."
Bottomless MagazinesThis one also bothered me:
"Gangsta Style: In the manga, this is how Kazuo Kiriyama fires every single weapon. Apparently, genius though he may be, he fails to realize that this is a highly ineffective method of firing a handgun, to say nothing of firing an automatic weapon. However, this is sometimes an Averted Trope due to a few instances where he appears to fire normally."