A group of immigration hardliners who used millions of crowdfunded dollars to build a border barrier on private land along the U.S.-Mexico border unveiled the nearly completed half-mile steel bollard fence Thursday following construction delays.

The 2,300-feet-long project marks the first time a nongovernment organization or individual has built a wall on privately owned land on the international boundary. It runs up a rocky 320-feet-tall hill and is 18 to 20 feet tall, depending on the point on the hill where it is measured.