Engadget has a nice little pic and story
on a home-fab Wiimote gun mode that gives you very long looking gun. The Wiimote's position actually looks like it would make a good silencer. There's been a few add-ons
already for the Wiimote to make it look like the object you're using in Wii Sports so it's only a matter of time before some third party or Nintendo comes out with a gun attachment.