300 blk IMHO.
The MPX for the second vote as you can always buy another 5.56 upper later.
I personally would keep both SBR'd AR lowers and the MPX. Sell the MK18 upper and some other hobby items you no longer use (kayak, fishing gear, camping gear, MTB, guitars etc.) You WILL regret selling guns.... especially on an election year. As long as the bills are being paid, wait at least another couple months when the panic starts up again.
"When governments fear the people, there is liberty. When the people fear the government, there is tyranny. The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government." Thomas Jefferson.
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