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No, only the 20" models with the two barrel guide rings have a bayonet lug on them. The 590A1 I bought was the 20" model with a bayonet lug, while it's cool, not a terribly useful feature at the end of the day.

Steven, unfortunately no Sir, only the 20 inch barrels have the bayonet lug.

I thought about pulling a James here and stating Trevor's answer as if I knew for sure, but that'd be dishonest, Trevor knows his stuff and certainly knows the weapons he owns, id take his word for it