I purchased a Gheleon's Demise from the Iron Banner vendor, and it has my favorite sights: the RED DOT-OAS. However, I subsequently won two more Gheleon's Demises, and both of them have my less favorite RED DOT-ORES sights. I wish they had the former, because I find it so much more precise and stable. I would use them on my two other characters. Why do they have different sights? Can this be changed by reforging them? Thanks!