Originally Posted by WoodChuck65
Same bolt setup just the 3.5 comes with an iv core stock as older ones do not. Other than the iv core they are the same
Pretty sure he means the soft tip bolt and hard tip bolt.
The soft tip is better on ultra fragile paint, although 99% of the paint you put through the marker should shoot with the hard tip bolt. Basically, only switch to the soft tip bolt if you're certain you're having chops due to the hard tip bolt.