SB Tactical HB AR Rifle Brace Black 556/300BLK Buffer/Spring. Lighter and shorter the HBPDW is the evolution of the adjustable PDW-style brace giving you all of the advantages of a pistol with improved control by adding an additional point of contact for stabilization. Specifications for SB Tactical HB AR Rifle Brace: Manufacturer: SB Tactical Color: Black Gun Type: Pistol Features of SB Tactical HB AR Rifle Brace: Available in both 5.56/300BLK and 9mm Lightweight low-profile and short 3-position adjustable Integral ambidextrous QD sling socket Compatible with mil-spec bolt carrier groups and AR lowers Package Contents: SB Tactical HB AR Rifle Brace SB Tactical HBAR-01-SB: HB AR Rifle Brace Black 556/300BLK Buffer/Spring