Live video coverage from WestWorld of Scottsdale Arena in Scottsdale, Arizona; Thursday, January 28th, 2021. USMS is a Mounted Shooting organization that provides a fun, safe, family-oriented environment for competition. The sport of Mounted Shooting is a fast growing, high horsemanship, equine sport. All of our competitions are run on the 4D format that has made professional barrel racing what it is today. USMS puts a big emphasis on gun safety and accuracy. To win in this organization you must shoot clean while maintaining a high level of horsemanship.