How many magic missiles do you have at 4th level?

[Nihthawk]

I have each of the damage types set up independently from each.
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[LordEntrails]

I have each of the damage types set up independently from each.

Mr Z's and JohnD's point is that by doing what you have done, only a single concentration roll will be made. RAW says that separate rolls should be made for each missile that hits, rather than one (at potentially a higher DC).

Of course, every DM can run their game the way they want, but if your DM doesn't want a single roll, then doing this is taking away an advantage you have if you use it by rolling damage dice separately.