To wrangle this back on topic, if I wasn't royally screwed by gun laws then it'd have to be:
- Browning Hi-Power
- L115A3/Arctic Warfare Super Magnum Sniper Rifle loaded with .338 Lapua Magnum VLD rounds. (Currently holds the record for the longest sniper shot.)
- Gerber LMF II for when it gets up close and personal, possibly dual-wielded MGS3 style (Not MW2 style) with the Browning