The core of BHI-15's upper receiver program is a medium-contour Criterion barrel (a division of Kreiger Barrels) made of 4140 steel that's button-rifled and chrome-lined for durability. Featuring a ...
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The MR556A1 Upper Receiver Kit allows high quality AR-style rifles to be retrofitted to HK's famous pusher rod operating system. An MR556A1 Upper Receiver Kit includes a complete barrel assembly, HK ...
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