Cryo treating blocks?

Back in the 90's a customer of mine had a 300 Below shop here in phx.
He used to carry 2 rubber bands with him
One had been cryoed, it stretched twice as far as the other from the same batch.
He was into firearms accuracy & bench rest competition shooting.
He Cryoed lots of gun barrels/parts.
I'm sure it would have it's benefits
For Engine parts as well
I'm not sure if he's still in business.
A lot of people are very skeptical of it, but it definitely works. It may not work or benefit every single component that gets treated as much as other parts, but it does work!