Designed for all platforms capable of accepting a mil-spec carbine extension, the SBA4™ is a 5-position adjustable brace that greatly enhances the usability of the firearm by adding a third point of contact. FEATURES • Based on the popular SBM4™ brace design • 5-position adjustable • Includes mil-spec carbine receiver extension • Gun Compatibility: All platforms capable of accepting a mil-spec carbine extension • Integral, ambidextrous QD sling socket • Comes with adjustable nylon strap for custom fit • ATF compliant • Veteran designed • Made in the USA