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Mfg Item #: 590-SBM4-01-
A complete kit, ready-to-assemble on your Mossberg 590 Shockwave, which greatly enhancing the usability of the firearm by adding a third point of contact. It features a SBM4 pistol stabilizing brace, 7075 aluminum STDT pistol receiver extension, ERGO Flat Top SUREGRIP, ERGO Mossberg 590 adapter, and a castle nut.