Lawson is an arms dealer based out of Albuquerque, New Mexico.
Better Call Saul
Lawson shows Mike a few different rifles. After carefully looking at each one and thinking of another plan, Mike respectfully tells Lawson that he doesn't want any of the rifles. Mike offers Lawson money for his trouble, but he tells him not to worry about it and declines the money. ("Gloves Off")
Lawson gives Mike training with a sniper rifle he bought from him and gives him a free box of ammunition. ("Klick")
Lawson is referred to Walter White by Saul Goodman and sells him a thirty-eight snub handgun with the serial number filed off. He advises Walt to make a legal purchase instead but Walt shells out the cash ("Thirty-Eight Snub").
Lawson receives a call from Walt, who is returning to town after spending several months hiding in New Hampshire, he asks Lawson to provide him with an M60 and a new car. He arranges to meet Lawson at a Local Denny's. After Lawson arrives, Walt meets with him in the restroom of a Denny's. After asking for confirmation that "it" won't be crossing the border, Walt tells him that "it" won't be leaving town. After the purchase he gives Walt the keys to the car, where the M60 is in hidden, he wishes Walt luck and leaves. ("Live Free or Die").