Officially, yeah. You have voided the warrantee. But, I'm certain Benchmade Knife Company will be able to accommodate if you ask them to replace Omega spring.
As Rev always post that "The answer is no, unless you ask". I take it you are swapping blade of similar mini-Griptilian, right?
Before you do, would you mind sharing what you are intended to do? (blade steel, style, laser etching, handle material, 3rd party handle, etc.)
MFL