Originally Posted by stalkingbear
There's been claims that cyrogenicallye freezing extends the life but I havn't paid close enough attention to round count to see the difference. I DO KNOW cyroing a rifle barrel WILL keep it from walking as it heats up.
The US Army AMU, among others, has done R&D to determine whether or not a cryoed barrel does have a longer life span than a non-cryoed bore does. The data strongly suggests that it does (barrel grade steel elicites abrasion resistance that is approximately 528% higher than non-cryoed barrel steel. The results were that cryoed bores last about 4 to 5 times longer than their non-cryoed cousins.
Another major benefit of cryogenics is that there is actually an exchange of atoms at the sub-atomic level, and that means that a piece of material that has been subjected to cryogenics is that the molecular structure of the material will be identical throughout the entire piece of material. Now what does that mean? It means that the material will not have "hard" martensite molecular structures, and "softer" austenite molecular structures in the material that will cause a variation in the amount of tool flex. The material (in this case we are, of course, talking about barrel grade steels, and receiver grade steels) will be of uniform molecular structure and hardness (martensite) and the tool flex will be constant and consistent. It is then possible with tight running toolroom machines to ACTUALLY hold tolerances of 1 or 2 10,000ths of an inch throughout the entire machining process.