I'm not aware of any Gaming and/or Mechanical keyboards that are wireless.
Gaming keyboards - no. Wireless keyboards - several. are known. All Microsoft wireless keyboards in the 5000 and above series are mechanical (despite being wireless), as are all of Logitech's wireless keyboards for Windows, including the hypercheap K360 and K400. Why do folks insist on believing that wireless keyboards can't also be mechanical (rather hilarious, considering that my Wireless Keyboard 6000 V.3 is almost a decade old - and it's not even the oldest of Microsoft's wireless mechanical keyboards)?
Mechanical keyboards - whether wired OR wireless - are mostly sturdier in construction than non-mechanical keyboards. Where wireless keyboards - mechanical or otherwise - have issues are in terms of two issues - interference (a problem with multiple wireless devices in general) and wireless lag (same thing).