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Pretty big opportunity for ex-NHLer-turned-actor Sean Avery ... who says he just locked up a role in Mark Wahlberg's new movie about the Boston Marathon bombings.

Avery posted a pic of himself in a Watertown PD uniform ... just days after announcing he got a role in "Patriots Day."

FYI -- The Watertown PD heroically hunted down the terrorists who placed the bombs at the 2013 Boston Marathon.

Unclear how big of a role Avery will have, but he's clearly excited about it.