SB Tactical SBA4 5 Position Adjustable Rifle Brace FDE. The SBA4 is compatible with any mil-spec carbine receiver extension (not included). Specifications for SB Tactical SBA4 5 Position Adjustable Rifle Brace: Manufacturer: SB Tactical Gun Type: Pistol Condition: New Features of SB Tactical SBA4 5 Position Adjustable Rifle Brace: Designed after the SBM4 5-position adjustable Integral ambidextrous QD sling socket Package Contents: SB Tactical SBA4 5 Position Adjustable Rifle Brace SB Tactical SBA4X-02-SB: SBA4 5 Position Adjustable Rifle Brace FDE