I have a Spikes lower and it has markings of 223, 5.56 and I want to put it on a .50 Beowulf upper. Now is this legal or not? I'm not sure about the change of the cal. stating one cal. but being another..... So if any one can help me out.
Yes I know that they are milspec. Thank you.
Yes I know that they are milspec. Thank you.

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