Today at my lgs I swapped my 12ga Shockwave for the lighter, handier 20 ga version. Motivation was curiosity about this engineered down 20 ga 590. I assumed that because it's a new design, then these specimens would be made with new tooling. Cursory examination shows crisp lines and a minimum of tool marks. The action is slick and needs no tuning. Weight difference is significant. Of course recoil will be heavy because of its lighter weight. I like it but admit the Shockwave has a hard to define mission.