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Charles, yes Sir, it FITS: Mossberg 590 Shockwave 12 & 20 gauge. Cheers and stay safe!

yes it does see ******Specifications and Features: SB Tactical 590-SBL Pistol Stabilizing Brace 590-SBL-01-SB Complete Assembly Ready To Assemble 12/20 Gauge Shotgun Compatible ATF Compliant US Veteran Designed Proudly Made in the USA Overall Length 11.75" Overall Width 1.6" Strap Width 1.0" Overall Weight 18.5oz Matte Black Includes: SBL Pistol Stabilizing Brace STDT pistol receiver extension ERGO Flat Top SUREGRIP ERGO Mossberg 590 adapter Castle nut Adjustable nylon strap ********Fits: Mossberg 590 Shockwave 12/20 Gauge Models Only