Pachmayr Gun Works 1081240: TacStar's Brass Catcher is the perfect accessory for AR shooters who reload. It simply clamps to the Picatinny rail of flat top AR's. The mounting bracket is adjustable and low profile, so it can be positioned to clear optics or scopes. The heat resistant catch bag can hold up to 120 .223 cases and can be unsnapped from its aluminum deflector plate for thorough cleaning.