Cool, thanks for the lowdown guys!
Sounds like that just has to be done. As far as getting there with a pistol, [OldManVoice] Back in my day [/OldManVoice] in COD4, a pistol was your only backup until you could level up and even then you'd have to sacrifice another perk for overkill. I would consider doing it passively: put a regular pistol as your secondary weapon when you snipe. That way, if somebody gets close, that's about your only option. No better teacher than necessity. It might take a while, but at least you're not spending entire sessions getting your ass whipped when you only have a pistol.