Major buys several guns from his supplier on the docks in episode 1x12 "Dead Rat, Live Rat, Brown Rat, White Rat". Major waits at the docks for Roche and then they head off to break up a blackmarket brain operation in episode 4x08 "Chivalry is Dead".
Major brings Angus DeBeers to his storage unit and dumps him in a freezer in episode 2x06 "Max Wager". Major talks to Natalie and then puts her in the freezer in episode 2x09 "Cape Town". Major fakes Floyd Baracus's death in episode 2x12 "Physician, Heal Thy Selfie". Appears in 1 more episode.