A pistol brace is an accessory attached to the rear of certain pistols, usually with the idea of helping stabilize the firearm against the forearm rather than the shoulder. It is often associated with AR-style pistols and was originally marketed to aid shooters with limited arm strength or mobility.

Quick Scoop

  • Basic idea: It’s meant to improve control and stability when firing a pistol.
  • How it differs from a stock: A rifle stock is designed to be shouldered, while a brace is intended to strap to the arm.
  • Why people talk about it: Pistol braces have been part of a major legal and regulatory debate in the U.S. because their use can affect whether a firearm is treated as a pistol or a short-barreled rifle under federal rules.
  • Legal status: Sources in 2025 describe the federal situation as unsettled or tied up in court, with different explanations about whether the rule is enforceable.

In plain English

Think of a pistol brace as a “stability helper” for a handgun. It is not the same thing as a rifle stock, and that distinction matters because shoulder- fired use is part of what can change how the firearm is classified.

Important note

If you’re asking about ownership or use, the legal rules can change and may also depend on your state. For anything practical or compliance-related, it’s safest to check the current federal and state guidance before buying, modifying, or using one.

TL;DR: A pistol brace is a forearm-stabilizing firearm accessory, not a rifle stock, and its legal status has been the subject of ongoing U.S. regulatory disputes.