Listings >> Food >>Casual M Shack – Riverside burgers, shakes and more (904) 423-1283 @mshackburgers Website Write a review Review Share Share Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) More Popular Listings: Rate and write a review Cancel replyYou must be logged in to post a comment. 1012 Margaret Street Jacksonville 32204 Get directions Casual Food Monday – Thursday: 11:00 am – 10:00 pm Friday – Saturday: 11:00 am – 11:00 pm Sunday: 11:00 am – 9:00 pm Photo gallery All photos (2)