https://midstatefirearms.com/product/sba3-lower-build-kit-sb-tactical-ar15-pistol-brace-kit-w-lpk/

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This SBa3 lower build kit comes with everything to make your stripped lower a complete lower.  Includes a lower parts kit, mil spec buffer tub kit, and the SB Tactical SBA3 pistol brace.  The sba3 brace is the most popular adjustable pistol brace on the market today.

NOTE:  Be aware of new rules and how they affect pistol brace builds: https://www.atf.gov/rules-and-regulations/factoring-criteria-firearms-attached-stabilizing-braces

PRODUCT DESCRIPTION

Designed for all platforms capable of accepting a mil-spec carbine receiver extension, the SBA3 is 5-position adjustable, dramatically enhances versatility, and features a minimalist design with an integral, ambidextrous QD sling socket.

Features:

• Minimalist design
• 5-position adjustable
• Includes 7075 mil-spec carbine receiver extension
• Integral, ambidextrous QD sling socket
• US veteran designed and proudly made in the USA
• Product includes:  brace, mil-spec carbine receiver extension, adjustable nylon strap