[SZonian]

Apparently, there are many options available and some do look authentic to some degree...

http://www.bing.com/images/search?q=wii+gun+controller&qs=IM&form=QBIR&pq=wii+gun+cont&sc=4-12&sp=1&sk=

[MHGinTN]

I have a couple of CO₂ BB pistols which were designed to look just like Beretta pistols. At a glance I doubt anyone could tell they are BB pistols, especially if the end of the muzzle is not visible, as in pointed right at you.