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They can. It is almost impossible to lay in a layer of chrome perfectly even. Without post plating machining, which few companies do due to the expense involved, the plating puts ripples in the bore. These ripples throw the bullet around and leave it wobbling as it comes out of the muzzle.

Chrome lined barrels are really only necessary to reduce muzzle erosion under sustained full auto fire.
 

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Chrome lined barrels are really only necessary to reduce muzzle erosion under sustained full auto fire.
Chrome lined barrels were first fielded in military bolt actions where the activity was in tropical environments. The thought was that the liner would slow down the effects of corrosive ammo in moist environments. It must work, because my Arisaka T99 has a pristine chrome bore, and the rest of the rifle looks like it was rode hard and put away wet.
 

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Chrome lined barrels were first fielded in military bolt actions where the activity was in tropical environments. The thought was that the liner would slow down the effects of corrosive ammo in moist environments. It must work, because my Arisaka T99 has a pristine chrome bore, and the rest of the rifle looks like it was rode hard and put away wet.
How is the accuracy?
 

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How is the accuracy?
I find it mediocre. I have never seen a chrome lined barrel shoot as well, on average, as the equivalent unlined barrel. Over the years, I have owned over 30 FALs; about half had chrome lined barrels. The best shooters were the unlined barrels.

Clint McKee claimed, about 7-8 years ago, that he had figured out how to chrome line a barrel in a fashion that enhanced accuracy. I have not seen any definitive studies to prove or disprove his claim.
 
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