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Bryan R. asked 6 years ago:
1 answer
CMMG MK9 PDW 9mm Black AR Pistol
Bryan, yes the MK9 does have last round bolt hold open : --- https://www.thefirearmblog.com/blog/2014/08/12/gun-review-cmmg-mk9-pistolupper-group-9mm-pdw/
James G.
6 years ago
