The Colt AR-15 Barrel features a true 5.56x45mm NATO Chamber for use with both commercial and military surplus ammunition, while the 1 in 7 Twist Rifling is capable of stabilizing light to medium weight projectiles of up to about 77 grains. The included front sight base is designed for a rear …

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Colt LE6933 Barrel AR-15 Pistol 5.56x45mm 11.5″ 1 in 7″ Twist Government Contour Carbine Gas Port with Front Sight Base Chrome Lined Chrome Moly…

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