SIG SAUER questions ATF’s reversal in position that the classification of their Pistol Stabilizing Brace may be altered by its use.
SB15 Pistol Stabilizing Brace Kit With Buffer Tube Flat Dark Earth
If I have a pistol brace on my gun and it has a barrel longer than 16 inches, do I need to take off my pistol brace? - Quora
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ATF Final Rule on Stabilizing Braces: Understanding Constructive Possession
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New pistol-stabilizing brace regulations to impact millions