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Putting a stock on a Shockwave would be considered manufacturing a short-barreled shotgun and necessitate an ATF Form 1. If that is part of the plan, then yes this product will fit.

James, yes Sir it would but, would require registration as a short barreled shotgun and payment of a $200 Tax Stamp. A Brace would avoid the hassle (example) : https://www.krollcorp.com/sbt-590-sbm4-pistol-stabilizing-brace-kit-for-mossberg-590-shockwave-160.html

with the political climate today I would avoid ANY modifications to the shockwave style guns with just the change in the way they interpret a rule you could find yourself in hot water> I expect this to soon happen with pistol braces for the AR pistols also infact they almost did it in 2021 https://townhall.com/tipsheet/mattvespa/2021/06/17/thousands-flood-atf-with-comments-over-rule-change-could-land-millions-of-america-n2591083

James, it would fit, but it would re-classify it as a SBS, which would require registration and a $200 tax stamp.