Eightbore has it right; first and foremost check the motion (if any) with the forend in place correctly. I always use the "washrag" test: with the forend on, twist the barrels with the forend in place with one hand, with the other hand rotate the grip in the opposite direction forceably. If you can perceive no movement, you are probably OK. On the other hand, if you can shake the gun held vertically by the grip with the forend off and you see or feel excessive movement, you are probably looking at a rejointing job (either barrel lug buildup using metal deposition and recontouring to the roll pin or a similar procedure to the roll pin itself). There is a very simple fix to the forend iron involving a slight distortion to the radius of the rotating locking latch which is achieved using a drift or punch, but it is something you do not want to watch being done, trust me! This procedure restores the required friction surface against the rear of the forend iron, which provides the correct pressure against the face of the receiver to hold the barrels correctly on face. Again, this is in the case of a loose or worn forend iron only, and will not compensate for a severly worn or damaged barrel lug or roll pin.
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