Three is a budget, not a collection quest
A fourth favorite gun is a stash entry until you make room. Swapping mid-job is legal; carrying six “mains” is not. If a new Excellent drop is better than slot two, replace slot two. Do not keep the loser equipped “for proficiency” while it loses you fights.
The donated gun is a start, not a forever main
Bobby’s weapons contact can gift a piece after the tutorial beat. Use it. Do not freeze the three slots around a gift if an AR you bought with scrubbed cash clearly hits harder. The beginner guide is the first-hour route that gets you to that shop without skipping the car and the phone.
Rarity labels on the next gun you buy are unofficial until recaptured — read them as a shop sort, not a promise.