The ring on the guard fits over the barrel and there is a latch or clip that attaches to the rear end of the handle. Search for “how to attach an ontario okc3s to a rifle” and there will be a few pictures here and there.
I have one for my M590 pump, fits perfectly. But I really hope that I am gone before I ever have to use it. Lol That would mean things have seriously escalated to a point where I would rather be gone. Lol
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