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Have you been able to find anything yet? Any 500/590 tube will work in the length you need, I'm doing a change over right now from a molded forend the problem is the slide bars are about a 1/4 inch too short I'm assuming it is because the 500/590 are 3 inch cambered and the 535 is 3.5 inch chambered.
If you could let me know what you used or were using it would be a great help if you went that route also.