Glock Factory 20 21 Sport Combat Holster (Ambidextrous) This Glock factory sport/combat holster for concealed carry allows rapid drawing of the pistol and is comfortable to wear because of its flat shape. A special trigger guard retention device secures pistol in holder. Constructed of durable and lightweight polymer. Can be adapted to various belt widths up to 2.50 Inches. Ambidextrous holster.