REWARDS - Respect, $10,000, Don Peyote unlocks
Head to the factory on your radar. There are some guys driving around in a car, so you can either wait for them to drive by, or you can sit back and snipe the gas tank to take them out. Either way, when you enter the factory, you'll have to fight an unavoidable battle with around 12 guys. Find cover and peek out to take shots at them when you can.
After you clear the factory, target and destroy all 10 machines. Watch out, as periodically more guys will show up. Kill them as they come. After all 10 machines are finished, slowly move to the wall opposite the entrance and take out any guys inside the place. Slowly move to the entrance and take out a guy on top of the boxes outside. Get out of the compound and get back to the casino to finish the mission.