Run a search in the Loader forum for the word "grams" and you should be able to find a few threads where I have listed the weight of a few different loaders, with and without batteries in some cases.
The VLocity/Jr. is the lightest of the full force feed loaders, and lighter than the Evlution 2 and 3 by a fair margin, but there are a lot of other loaders that are lighter than the Evlutions. Apaches certainly, and pretty much all the agitated loader (not sure if that was what you meant by gravity, or if you meant simple gravity loaders without an agitator).
If you are looking for the lightest of the fast loaders, the VLocity's are where to look. The Evlution's are actually some of the heavier loaders out there.
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