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I just got my Griffin Armament Checkmate approved (along with my Silencerco Omega) and I'm happy as can be with it. I really like it's QD function, taking it on and off with just a quarter turn twist. I have both my 10/22 and Mark III threaded and equipped with the QD tri-lug attachment, so I'm swapping the Checkmate btwn those two firearms within seconds.
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