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The Magpul BTR is an AR arm brace that aims to improve the single-handed usage of large-format pistols. The BTR utilizes Magpul design and engineering, resulting in a stabilizing accessory with a robust feature set and trusted Magpul quality. The BTR is compatible with Mil-Spec carbine receiver extensions and features a simplified, durable, and easy-to-use LOP adjustment mechanism. Additionally, there is an integrated QD cup and M-LOK compatible slot that provides ambidextrous sling mounting options while enabling stabilizing sling tension to be applied. This drastically increases single-handed control of the firearm. The BTR is a straightforward design and, with Magpul innovation, a simple solution to improving your AR pistol. Please note that the final firearm configuration is subject to applicable federal, state, and local laws.

Here are the key features of the BTR:

- Designed and intended as a stabilizing accessory for one-handed firing
- Toolless, single-handed LOP adjustment
- Ambidextrous rear QD cup allows sling tension to be applied while firing with one hand to improve stability
- Compatible with Mil-Spec carbine receiver extensions
- High-strength polymer and metal construction
- M-LOK compatible slot for additional sling mounting options
- Only compatible with Mil-Spec carbine receiver extension equipped AR Pistols and not compatible with proprietary, pistol, or commercial receiver extensions.
- All ATF, NFA, state, and local rules and laws apply, where applicable.

The ATF has ruled that attaching stabilizing braces with certain features will not make a firearm NFA controlled. This product conforms to this ATF precedent. However, please note that as of December 10, 2019, the ATF is no longer issuing classification letters for firearm accessories, including stabilizing braces. This product is designed and intended to serve only as a forearm brace for one-handed firing of a pistol, and it is not recommended to be fired from the shoulder. Any redesign or reconfiguration of this product may render the attached firearm NFA controlled. The user is exclusively responsible for determining the correct application of state and federal law based on the unique configuration of each firearm.