By Sam Laskaris Writer Six Nations Snipers’ veteran Mike McLaughlin is not calling it an upset. But the Snipers did manage to defeat a higher-ranked opponent in their opening playoff contest on Sunday to advance to the Arena Lacrosse League (ALL) Final Four playdowns later this week. The Snipers are the defending ALL champs. But the local squad had its share of struggles during the regular season this year, posting a 5-9 record to finish in sixth place of the eight-team league. Six Nations, however, managed to register a 15-13 decision over the third-ranked Oshawa Outlaws in their league quarter-final matchup, held Sunday at the Brampton Memorial Arena. “I don’t think I heard the word underdog at all in our dressing room,” said McLaughlin, a defender who chipped in offensively…