To help you find all weapons and field upgrades in the 3rd mission “Reactor” in Modern Warfare 3, we're revealing a map showing where all 29 items are hidden.
Here's what you can expect in our guide:
- Our map displays all the locations where you can find the weapons and items.
- We also explain how to locate the orange boxes precisely.
All 29 Weapons & Items in the Reactor Mission with a Map
In the open 3rd mission “Reactor”, you can find 24 weapons and 5 pieces of field equipment in orange boxes. During this mission, you'll need to destroy 3 helicopters and ultimately assault the reactor and escape from the poison gas. You can clear the entire map and then leisurely search for all items before actually continuing with your mission. On our map below, you can see all the locations. The weapons are marked in red, and the field equipment in green.

The red markings correspond to the locations of weapons. The green markings indicate the items.
Here you can Find all Weapons:
- Silenced Holger 556: You can find it in the warehouse. You can get in through the roof and then open the door from the inside.
- Incendiary MCW: You'll find it on the roof. On the south side, there's a rope for climbing up, assuming you already have a climbing harness.
- Incendiary Sakin MG38: Located on the 1st floor on the south side of the building.
- KV Inhibitor: At the top of the crane, you'll find the sniper rifle. You'll also need a climbing harness here.
- Minigun: To get the Minigun in the fire station, go up to the roof and climb the tower. At the top of the tower, aim down through a hole and shoot the explosive barrel to open the blocked door. Then, you can collect the Minigun from below.
- RGL 80: You can find the grenade launcher right next to one of your mission objectives, near the helicopter, among some crates, including an orange weapons crate.
- Silenced Cor 45: Next to the helicopter, there's an under-construction cooling tower. Climb up, and you'll find the COR-45 in a small supply box.
- Silenced Expedite 12: From the under-construction cooling tower, you can use a zip line to reach the next weapon box.
- Sidewinder: On top of the roof. There are several ways to get up there.
- Basilisk: To get here via the roof, you'll need to break a window to access the locked room.
- Hybrid STB 556: You'll find it behind a truck next to the helicopter.
- Pila: The rocket launcher is located next to the helicopter.
- Explosive Crossbow: You can find it on the rooftop. Once you've found weapons 11 & 12, you can climb the building at the landing site, swing over with the zip line, and continue up to the marked roof.
- Signal 50: If you continue running south across the roofs, you'll find the Signal 50 sniper rifle at the end of the roof.
- Incendiary MTZ Interceptor: If you head back towards the crossbow, you can jump to your left from the roof. Down below, you'll find the Intercepter on a truck.
- Incendiary FJX Imperium: The sniper rifle can be found at the top of the crane. The only access point is a climbing rope inside the cooling tower.
- HCR 56: Right next to the crane, you'll find the HCR 56 on the ground floor of the building.
- Incendiary Haymaker: You'll also find the Haymaker right next to the HCR 56.
- Incendiary Bryson 800: South of the reactor inside a large hall.
- Silenced Lachmann MP: You can find the Lachmann-MP in the next room to the east.
- Silenced Vel 46: On top of the small office container.
- Fennec 45: North of the helicopter, you'll find a small warehouse. It's open, and you can grab the Fennec directly.
- Cronen Squall: Directly south of the helicopter.
- Holger 26: Directly south of the helicopter.
Here are all the Field Upgrade Items:
- Snapshot Pulse: In the garage of the fire station, downstairs.
- Heartbeat Sensor: Inside the cooling tower, directly behind the Suppressed Expedite 12 (Weapon #8).
- Ammo Box: Right next to the crane, you'll find an ammo box on the 1st floor of the building.
- Anti Armor Rounds: Located north of the reactor in a workshop.
- Armor Box: In the office container where you found the Vel 46 (Weapon #21). To get inside, look for a window on the eastern exterior wall and shoot the chair blocking the door from there.

You've now found all the weapons and items in the 3rd mission. However, there is no specific achievement for this. You can use all the weapons you've found in the campaign missions, giving you a strong starting equipment advantage.
Are you looking for all the weapons and items from the other open combat missions? Then we have the right guides for you!
Every tip mentioned in this guide has been practically tested by our team to ensure you receive reliable and accurate information.