The Universal Brass Catcher by Caldwell is hinged to allow you easy access to your chamber without the need to remove or reset the entire brass catcher. The universal double hook and loop attachment lets you use on semi autos and bolt actions to minimize catcher bag sagging. The internal cage design supports the heat-resistant mesh bag. Offers a large 100 round capacity (.223).Specifications and Features: Heat-resistant mesh bag Internal cage design supports the mesh bag Large 100 round capacity (.223) Swing open design allows easy access to chamber Universal double hook and loop attachment lets you use on semi autos and bolt actions to minimize catcher bag sagging