Before going on the mission, if you've already earned 9 "respect points" with Salvatore and have learned about the lightbringers from Jules or Father Tully, you can request a laser pistol from him. Mason will give it to you, and if you ask he'll teach you to use it, improving your Energy Weapons skill by 5%. Asking for the pistol without enough respect will damage it further (you may be planning for this if you aren't going to become a Made Man).
When you talk to Mason for the details, you can either choose to go now, or wait. In the latter case, you are given one game day to come back or you'll miss the opportunity (and Mason will not take kindly to it). When you accept to go with them you'll be sent to an outside location where five of Salvatore's guards and two Enclave soldiers are making the deal. During the transaction it is obvious that the Salvatores are scared of the Enclave. Move around and you're liable to be attacked, so just wait patiently until the other guards leave, and follow them. Do not approach the Enclave soldiers or try to talk to them.
If you don't screw up, the transaction will go off without a hitch, and you'll be able to return and talk to Mr. Salvatore. You get 1000 XP for completing the mission.
- a Wattz 1000 laser pistol if you didn't already get one at the start of the quest
- 50$, or
- with Salvatore's "respect" of 16 (only achievable by jumping through hoops, see the link):
- Metal armor
- 150$, or
- also with enough of Mason's patience:
- Metal armor Mk II
Being a made man gives you respect from others, but also makes you unable to go into the other family hideouts (without a fight to the death, that is). However, rejecting Salvatore's offer causes his guards to attack you. So either conclude your business with the other families, or be prepared for a fight when you return to assassinate Boss Salvatore for Big Jesus Mordino through the stealthy options before tackling his men.
- There are some circumstances which turn Mason hostile if he waits at all. It is unknown whether this is a glitch or if it is the result of certain dialogue choices. In either event, the safest option is to simply ensure you are prepared before talking to him about the details of the assignment.
- It is possible to get to the secret site and watch the transaction without taking the quest. This is not related to this quest.
- However, if spotted during that event, the quest becomes unsolvable: some of the guards will be hostile and so will Mason when the Chosen One speaks the next time they meet him.
- It was originally possible to inspect the Vertibird the Enclave soldiers landed in. This'd give the chance to slip inside, and be transported to Navarro to be attacked or taken to the Commander (and then attacked).