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This standard mil-spec CAR castle nut is made from steel by Ergo and coated black.
How to install the SBA3™ Pistol Stabilizing Brace® onto an AR platform using a mil-spec carbine receiver extension.
The Bureau of Alcohol, Tobacco, Firearms and Explosives has issued several letters regarding SB Tactical® Pistol Stabilizing Braces, including this letter from 2017 that reverses the ATF’s 2015 Open Letter position on “use” of SB Tactical Pistol Stabilizing Braces.
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