[quote=@Cuccoruler]
If jack has been meaning to ask for awhile now then why bother with the gun? Feels a bit unnecessary
[/quote]

Because I mean come on! DRAMAAAA~! 

And also it's not that he has any intention of hurting anybody. If anything it's a scare tactic to make sure that John and Car-tali aren't a threat to Ace or himself, though he won't hesitate to kill someone who poses a threat