“Head over to that location. There's an arms dealer there we need you to find. We're trying to stop Avon, or Cliffford, or... whoever's calling the shots over there, from arming themselves. They put an order in for a Barrage, a heavily weaponized ATV, which we're going to intercept. You're paying a visit to the dealer, finding out how the order's being filled.”
— Lester's briefing.
The crew is instructed to go to the location of an arms dealer which has the information of a flight path of the Barrage ATV ordered by Avon. The dealer will be found at a semi-random location.
Once a member of the crew finds him, they are instructed to follow him to a quiet spot, keeping a safe distance to not alert him. Once they find a quiet spot, Lester instructs the player to take him out and grab the briefcase so they can deliver it to the facility. If the crew somehow fails to follow and take out the target quietly, a 3-star wanted level is triggered, complicating the preparation.