After reading several threads on the 590a1 heat shield, I called/emailed Aimpro at the end of last week and was told by Mark that they did not have any in stock and it would be anywhere from 4-6 weeks to a few months before 16335P would become available. So remembering this thread, for the hell of it I called Mossberg and talked to sales and asked for the same part number and referenced the above catalog, saying i needed part # 16335P (parkerized) for the 20" heavy walled barrel for my 53693 tactical/tri-rail 590a1. She put me on hold to check with someone and confirmed they do have it but it would take 4 weeks and it would be $38 plus $6.90 s/h. Knowing people on here were paying $80 from Aimpro and only seem to get it from them and not Mossberg made me think she confused and was thinking it was for a 500 or regular 590 w/ the 18.5 barrel. I asked for clarification several times along with specifying the model/specs to be as sure as i could over the phone and she said it was the right part/price. So, given the wait on Aimpro and the price from Mossberg, I ordered one. Thanks for posting the link to the catalog Garmonbozia. Really not sure what I'll end up getting, but we'll see...