Personally I like the way velocitys look on short guns like gen4 timmys becuase then the back of the hopper is above the back of the gun. But I think the velocity would still look nice. And the velocity may be lighter than a empty halo but I doubt its lighter when both hoppers are full becuase the velocity holds more paintballs. I say if your really looking to cut down on weight get a stiffi, lithum battiers for the halo, a 45/45 or one of those new tanks that are only available in europe at the moment that weight like 1/2 the weight.
You of course realize the weight difference in the loaders is negligable...the real cause of the weight is the paint....which the Vlocity holds more. If you're that desperate to reduce the weight, go with a 45/45.