Has any one heard or read about why all the wager match servers are stuck on stick and stones only.

I've played 'gun game' and 'one in chamber'.  It randomly rotates as far as I can tell...

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If you hit random join it'll put you randomly on any of the many wager matches.. sticks and stones seems to be a popular one so you'll get that one more often.  If you want a specific wager match go look for those dedicated servers (all wager matches are on dedicated wager servers set to one mode) in the server browser.  Remember to reset your filters, though, because all wager servers are non-HC; there you can browse wager servers based on ping and/or wager-match-type.

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