Originally Posted by sssnoboarder69
If the eigenring is like other tophat mods, it basically makes the volume in your dump chamber smaller. So you have to increase your HPR pressure to compensate, which gives you more kick in return for better efficiency.
The Eigenring is not a tophat mod. It does take up a small volume, but that's not what makes the gun more efficient. The Eigenring slides back when the dump chamber is emptied and prevents excess air being vented out of the dump chamber.