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.
.jpg)
