L stands for Longer range and a little slower reload. D stands for Shorter range and faster reload.
They are different versions of the same gun. Shell damage is the same.
I think you should be able to see the mark III L with Pow, as it is lvl 76, just be sure to select one of the two big R mounts, as if u check Pow has 2 R slot sizes: 457(which is enough for 14"quadsmk III L) and 388 (which is enough for 14" DUALS mark II L)
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