CYRO is a technology without legitimate parents in any manufacturing process.
In actual tests of 10 random rifles, it made little difference or made accuracy worse !
Selection of premium ammunition compents or carefully engineered hand loads will make more difference.
In super=premium barrels, It may increase life of the barrel and performance.
Les Baer's AR's...the most accurate AR's on the planet, have very high quality barrels in materials, interior finish and are double cyro treated prior to Bear Coat which then heat stress relieves the barrels with the barrel extension in place = under 1/2 MOA accuracy with almost any ammunition.