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Installing front sight frame on stainless barrel

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I am in the middle of a PTR-91 build, and have a surplus G3 triple frame assembly with grenade launcher ring, as well as the stainless steel heavy barrel from My question is this: Since the inside diameter of the frame is just a bit smaller than the outside diameter of the barrel, how do I go about enlarging the barrel retaining ring of the sight frame? Also, on the sight frame, it appears that the grenade ring is a separate piece somehow pinned into the frame. How do I go about removing this, is it advisable, or should I just ream out (or other method) the sight frame so it will fit the barrel?