[The Fifth Horseman]

Market refills on each Monday.

To raid a corp without infuriating them, you need to ally with them, equip everyone with Stun Grapples (or at least as many agents as you have grapples) and then raid that corp. This sort of mission is not too easy, as you have to do with just Stun Grapples, but when you get used to it it's quite OK. You can get a lot of ammo for Autocannon, Marsec MG and AP grenades, as well as some gear that enters the market only on the beginning of second or third week.