The DW 621 might.
See http//www.patwarner.com/621_offset.html link for some evidence
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I have looked on the Internet and cannot find the answer to this question:

If I get a plunge router will it do EVERYTHING that a fixed base router
will do if the base is locked up?

Sorry for the simple question, but I can't believe that I can't find the
answer on the web anywhere.