McDONALD'S, McFLURRY with M&M'S CANDIES: regular (12 fl oz) to Grams
Quick answer
One regular (12 fl oz) of mcdonald's, mcflurry with m&m's candies weighs 348 grams.
1 regular (12 fl oz)348 g
Reference serving (nutrition facts)100 g
Source: USDA FoodData Central - SR Legacy (2018-04) (USDA household portion weight)