On June 7, 2021, the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) introduced a Notice of Proposed Rule Making (NPRM) titled “Factoring Criteria for Firearms with Attached ‘Stabilizing Braces.’”
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The Ergo 500/590 adapter can be used to attach a brace and pistol grip to your Mossberg 500/590 or Shockwave. This kit includes an Ergo Flat Top Grip and mounting hardware. A castle nut is not included – don’t forget to pick one up here.
Made by Ergo Grips in the USA.