Are any of these servers what you are looking for?

Servers with "Sniper" and "Only" in the name:
-=TDH=- sniper only
|BiH| Rifle&Sniper/Toujane Only |DM| Server|
The Painters FFA Sniper only [B3]
=|GFG|=promod Sniperonly (Skins)
-=POC=- Pro Sniper Only
Sniper-Dreamland|>CUSTOM MAPS ONLY< |SNIPER RIFLE| by
Sniper-Dreamland|>CUSTOM MAPS ONLY< |SNIPER RIFLE| by
[b00bs] USA Snipers only (b00bs-clan.com) [UAA]
{F4H}Snipers Only
PaRe.:HQ:.Sniper Only