Complete Upper Receivers
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HK UPPER MR556A4 5.56 11 BLK
Heckler & Koch
MSRP: $2,462.27$2,179.00The MR556 upper receiver kit has been updated to include all the new A4 features, including new barrel profile, adjustable gas block, handguard and more. This kit includes a complete upper receiver/barrel assembly, allowing Mil-Spec 5.56mm AR-style...MSRP: $2,462.27$2,179.00