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 ...
Many agencies who have received M16A1's, via the DRMS 1033 program, have wanted to upgrade these rifles to carbine configuration and to get away from the 1/12 twist rate to better address the needs of ...
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