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223 Barrels
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- 18" Mark 12 Barrel 5.56 mm
- 4140 Chrome Moly
- Threaded Barrel — Thread Pitch 1/2 x 28
- Gas Block Diameter .750
- Gas Tube Length — Rifle
- 1-9 RH Barrel Twist
- 6 Lands and Groves
- Button Broached
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 "18\" MARK 12 BARREL 5.56MM")