The MR556A1 Upper Receiver Kit includes a complete upper receiver/barrel assembly bolt carrier assembly buffer and buffer spring allowing most high-quality 5.56 mm AR-style rifles to be retrofitted to HK�s pusher rod system. – Complete MR556 Upper Receiver/Barrel Assembly� HK 16.5 inch cold-hammer forged barrel upper receiver with forward assist extended convertible charging handle HK Free Floating Rail System handguard – Complete MR556 Bolt Group Assembly – Tungsten Filled HK Proprietary Buffer – HK Proprietary Buffer (Action) Spring
-42%
HK MR556 5.56 16.5 MLOK UPPER RECEIVER KIT
$580.40 Save:$422.00(42%)
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