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From pictures it appears to be a heavy barrel but can't find a definite answer anywhere. You would have to contact Smith and Wesson at 1-800-331-0852 or email them at qa@smith-wesson.com to find out for sure. Sorry couldn't give a definite answer but hope this helps some.
Adam, Smith and Wesson Customer Service can put this to bed for you at 1-800-331-0852 Mon-Fri 8:00AM-5:00PM Eastern Time. Cheers and stay safe!
Adam, S&W does not say on their website whether or not this has a heavy barrel. I would contact them directly for an accurate answer 1-800-331-0852 Mon-Fri 8:00AM-5:00PM Eastern Time. Have a great day!