5.56x45 chambers, Slightly used both are 16”, .750” gas block, 1/2-28th treaded muzzle, .080” gas port, 1:7 twist, mid-length gas system - 1( black) nitride coated and 1 nickel boron (shinny) both have less than 500 rounds on them and show good sharp rifling. $55.00 per shipped or $110.00 for both
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