The word "evolution" referring to the length of the bolt. Is a mere classification. Listing in length from longest to shortest....
Pre 2k length
Most bolt manufacturers make this length, but dont advertise it.
For instance, I ordered a Shocktech supafly delrin bolt once and I wanted a 2000 length, They accidently sent me a Evo length bolt. Apparently used on the p-blocked SFL cockers.
Pretty much, shop around for your favorite bolt, then call or write the manufacturer and ask if they make the evolution length. You'll be surprised. ESPECIALLY if the company makes a p-blocked complete gun.