If I was replacing the barrel, I would go ahead and replace the lug with an SSS squared and true lug and also a squared and trued barrel nut. Those are better because they are trued. If the slot in the aluminum rail is not wide enough for the new lug, grind it away on the muzzle side so it fits, but keep the breech side of the slot original. Treat it just like you would if you had bed it. (Keep the muzzle side and sides of the lug and bottom off the "bedding", or in this case, the rail). Also, keep the nut free.
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