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The Magpul BSL is an arm brace particularly made for AR pistols to improve one-handed usage. Magpul used their classic design and engineering to offer an accessory with a sturdy feature set and trusted quality. The BSL is compatible with Mil-Spec carbine receiver extensions and has a simple LOP adjustment mechanism that is durable and easy to use. It also has an integrated QD cup and two M-LOK compatible slots that provide the user with ambidextrous sling mounting options and enables stabilizing sling tension to be applied, giving the user more control of the firearm when firing single-handedly. It is a straightforward design with Magpul innovation and a simple solution to enhance AR pistols. However, the firearm configuration must abide by applicable federal, state, and local laws.

The arm brace is designed to be used solely as a stabilizing accessory for one-handed firing. The LOP adjustment mechanism can be effortlessly adjusted single-handedly using no tools. Furthermore, its ambidextrous rear QD cup allows for users to apply sling tension while firing with one hand to improve stability. Compatible with Mil-Spec carbine receiver extensions, this brace is constructed from high-strength polymer and metal. It also has M-LOK compatible slots for extra sling mounting options.

This product is for use with Mil-spec carbine receiver extension equipped AR pistols. It is not compatible with proprietary, pistol, or commercial receiver extensions. It must be assembled into a legal configuration by complying with all applicable laws. The ATF has ruled that attaching stabilizing braces with certain features will not cause a firearm to be NFA controlled, and this product meets this ATF precedent. On December 10, 2019, ATF ceased issuing classification letters for firearm accessories, including stabilizing braces.

It is important to recognize that this product is designed and intended to work only as a forearm brace for one-handed firing of a pistol and is not intended to be fired from the shoulder. Altering the design or reconfiguring the product can lead to an NFA controlled firearm. As such, it is up to the user to ensure that they follow the appropriate state and federal laws based on the unique configuration of their firearm.