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Man, they must really pound that barrel hard and for a long time to get it a third longer. It must relieve a lot of the stress from that piece of steel, just as the guy from Beretta/Sako/Tikka explained. He also said they reheat it afterwards for a couple of hours to finish the stress release process.

Did they say if that was a cold hammer process? Are they all cold hammered?
^ presumably, the firm I worked for used cold hammer-forged steel for auto transmission parts.

I believe the cold hammer process rearranges the grain pattern, almost forging strength.
 
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