It is the receiver reinforcement just ahead of the trigger .
I am going to use the low temp silver solder which goes at about 600F . This is below the critical temp for carbon steels . I know that the surface area of the faying surfaces will give a much higher bond strength than 6 or so spots which can actually concentrate the stresses , and also be possible crack starters . JB weld just does not have the tensile strength or malleability to perform in this type of situation . It will look good , but when it will really be needed to prevent distortion guess what .It will fail miserably .
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