The full-auto pistol is noticeably weaker than even the Glock. This makes sense when you realise that this particular Glock is chambered in .40 S&W, while the full auto pistol is chambered in the smaller 9mm round.
How is Niko in Alderney during the opening cutscene which takes place entirely in Alderney when in that cutscene is Jason, a member of The Lost who is killed by Niko well before he would have had bridge access to either of the Western boroughs?
Why didn't Ray send Niko after Johnny instead Jim who would've been much less of a threat? As Ray would've been aware by "Was It Worth It?/Pest Control" of Niko's proficiency in taking care of business, which almost definitely surpassed that of the assassin goons sent after Johnny, even if there were 3 more of them per car.
It's been established that Ray is an idiot who is so short sighted that he can't see that his entire family thinks he's a rat. He probably thought that if he just got rid of Jim, then it'd make Johnny realize that things were serious and he'd give up the cash.
