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$3,932.50
The HK MR556 A4 81000827 uses a gas-piston operating system with a 16.5-inch barrel and 5.56 NATO chambering.
The rifle includes a free-floating M-LOK handguard, adjustable six-position stock and enhanced pistol grip. Its barrel has a 1:7 twist rate and a 1/2x28 threaded muzzle. It has 30-round magazine capacity.