They put some type of steel bolt in the middle of a Revo to add weight to it.I've be a 314 guy for 25 years (on a custom butt with a snooker bevel on the back). I still use Ash 9.5mm for Snooker. Tried a bunch of CF cues. I don't see much improvement in LD over 314-3. In some cases worse. Don't like the balance. Very front light and they must add weight to back to achieve overall desired weight. Also I'm used to and like 12.75mm and all I have seen are under/over this. Thus I will pass. The only upside I see is durability. The price point is also not to my liking. I expect More for More. I know a little about manufacturing. I would bet that 314 costs Predator more money to make than Revo and lets not get into a discussion about R&D costs.
Take a magnet, hold it around the middle of a Revo shaft and voila! - you’ll be surprised.