Cryo treating blocks?

Winston Cup teams have used both Metalax and Cryo processes for over 25 years now. There are several places over in NASCAR country that do both. One is/was called 300 Below if they are still around....
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.