NHL's Sean Avery: I Got a Role In Boston Bombing Movie

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.

As for Wahlberg, he was actually in character at the Marathon Monday to shoot scenes for the movie ... which co-stars John Goodman, Kevin Bacon and J.K. Simmons.