Holosun 510CSPACER 510C Spacer Black
http://www.tandktactical.com/shop/605930624960-holosun-510cspacer-510c-spacer-black-36855
http://www.tandktactical.com/web/image/product.template/36855/image_1920?unique=85f73f7
Spacer mount for Holosun 510C open reflex optic. Spacer designed to support 1/3 co witness.
