It should actually shoot fast with high spread, the Mtar IS a CQB weapon anyways. The other counterpart, Tar, should be slower with larger damage.
And to improve the image, the top part of the gun needs more detail, since it's just a flat slab of pixels atm.
Edit: The back end also needs to be longer, and the front handle where the trigger is, needs to be shorter instead of that awfully large bar, the area before the barrel, needs to be a bit thicker as well.