Basic, quick, SA58 questions

[neoinarien]

Hi all (thanks for your ongoing help),

I was going to give DSA a call but figured I'd throw up all my latest questions.

1) Is there a 'golden' serial number range to search for in the SA58s? Conversely, a taboo range to avoid?

2) Are the SA58's lifetime warranty fully transferable?

3) Any good recommendations on a good elevation adjustable rear sight? (the DSA para I was looking at today has just windage... not sure what the status is on the SA58).

Thanks,

Tom