Barrel markings on an AR-15 rifle with 1 in 7 twist rate

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AR-15 rifle barrel with a flash suppressor. The markings show the caliber as NATO and a twist rate of 1 in 7 (1 rotation of the bullet every 7 inches) (Image is a training image and not from an actual case)

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Size: 3872px × 2592px
Location: Crime Laboratory
Photo credit: © Chaotic Paladin / Alamy / Afripics
License: Royalty Free
Model Released: No

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