User blog comment:Imrlybord7/Your Black Ops classes?/@comment-1367054-20100904012014/@comment-28584497-20100904013509

NV is developed by Obsidian, not BethSoft, which is lead by some of the creators of FO2, so of course they're going to give ammo weight; Oblivion was different because the only ammo they had were arrows.