In the warehouse shootout, Elias Marcos is using an Maxwell Atchisson ( Military Police Systems ) AA-12 Automatic Shotgun. Elias fired roughly 30 rounds before reloading. The magazine capacity of the AA-12 is 20 Rounds using the drum magazine, and 8 using a box magazine.
Art tells Wynn that there is only one US Marshall, that his title is Chief Deputy Marshall as he is in charge of the Lexington field office. That is incorrect, there are actually 94 United States Marshalls, the Marshalls are the law enforcement branch of the federal court system, which is divided into 94 districts. Each district is led by a US Marshall, and the different field offices are supervised by a Chief Deputy Marshall. The highest ranking person in the Marshall's service is the Director who operates out of the Marshall's headquarters in Arlington, Virginia.