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Yes it is threaded and can be changed Harry.

Here are some different a2 flash hiders --- https://www.google.com/search?biw=1600&bih=769&tbm=isch&sa=1&ei=K-sZWq-yPOSZ0wKHu5WABA&q=Core-15+flash+hider+threaded&oq=Core-15+flash+hider+threaded&gs_l=psy-ab.3...6979.6979.0.7183.1.1.0.0.0.0.79.79.1.1.0....0...1c.1.64.psy-ab..0.0.0....0.AiNcdgNQV1w

yes its threaded and easy to change