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The SB Tactical 590-SBM4 Brace Kit (590-SBM4-01-SB) is ready-to-assemble on your Mossberg 590 Shockwave right out of the box. The 590-SBM4 enhances the firearm by adding a third point of contact for stabilization with a M4 style brace. The SB Tactical brace is ATF compliant, U.S. veteran designed, and proudly made in the USA.