Can't remember who modeled it , since it was done before I joined, but I agree, it is low poly/boxy/ugly.
The model is based off the SWBF E-17D http://starwars.wikia.com/wiki/Image:E- … _rifle.jpg , which is what we called it before we found the DLT-20a rifle http://starwars.wikia.com/wiki/DLT-20A_blaster_rifle , which was actually in the movies - most notably held by IG-88. The model was planned to at some stage be remade to better suit the DLT-20a , but, to this date, was never gotten round to.
In essence, the E17D and the DC-15x are SWBF creations, which we tried to keep to a minimum (rebel shotgun being the only other 1 I believe) , instead looking towards the movie - even if these weapons were only seen very briefly and even if it meant, in the case of the T-10 and MK-1, naming the weapons ourselves.
There are a couple of other rifles that could do with a model update(I planned on updating a couple myself before I left , but never got round to it) but such things are often a lower priority than maps and vehicles.
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Frédéric Bastiat