The fastest way of obtaining Disarming Gold Stat award is by replaying a mission called Mrs. Chu’s Revenge. To replay the mission, pause the game and open up the Social Club menu. Select “Missions” tab and then the mission itself. Play the mission normally until you reach the warehouse where Ratface is hiding. After fighting a bunch of thugs you’ll reach a part of the mission where you’re asked to confront Johnny the Ratface and then immediately have to disarm a thug. After vaulting over an object and disarming the thug, pause the game and select “Restart from checkpoint” option. Now you can disarm the thug again and keep restarting the checkpoint. Disarm stats will carry over and count for the total so just rinse and repeat the process until you get the Gold Stat award. There’s no way of checking the Social Club while in the mission, so keep an eye on the bottom right corner for the Stat Award pop-up. I got about 30 disarms in about 6 minutes, so it’s by far the most efficient way of grinding Disarms. You don’t have to beat the entire mission for the stat to count, so feel free to cancel out of the mission after you’re done.