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I bought one a while back for my M1A. The instructions say you need to set it in place on the grooves, put the nut in about hand tight, and then hit the ends back and forth with a rubber mallet so that the aluminum mount forms to the receiver and matches with it, creating a solid mount.
I didn't like the big gap in the middle, though. So I tossed mine out (not good for resale by itself after it's been fitted) and went with an aluminum Sadlak instead.
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