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I don't know if Tandemkroos and Ruger collaborated on all of the awesome add-ons for the Mark 4, but it sure seems like they might have. I love the Halo, I think MOST of all! It's amazing what that simple little ring does for the function, as well as the overall appearance of the pistol. Super easy to install. Maybe could be a little less expensive, but I could say that about a lot of things these days.
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