Call of Duty Modern Warfare 3 (MW3) Walkthrough & Guides Wiki

Call of Duty Modern Warfare 3 (MW3)

How to Unlock SZ Heatsource 800 Attachment

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The SZ Heatsource 800 is a gun attachment found under the Optics attachment category of Modern Warfare 3 (MW3). Check out our guide to learn how to unlock the SZ Heatsource 800, its compatible guns, as well as a preview of its optic and crosshair!

List of Contents

How to Unlock SZ Heatsource 800

Level Up Guns in MW3 Multiplayer Modes

The SZ Heatsource 800 attachment can be unlocked by leveling up the following guns in MW3 multiplayer, Zombies, or Warzone:

Weapon Required Level
Modern Warfare 3 -TAQ-MTAQ-M Raise the TAQ-M to Level 25

Complete the Attachment's Armory Unlock Challenge

Modern Warfare 3 - Armory Unlock Challenge for Attachments

Alternatively, players who have reached Account Level 25 can opt to complete Armory Unlock challenges to get the SZ Heatsource 800 attachment, early.

Once you unlock this feature, modify your chosen gun at the Gunsmith and select the SZ Heatsource 800 from the Optic attachment slot of your weapon. This should activate its Armory Unlock contract, allowing you to complete Daily and Bonus Challenges to get it earlier.

Armory Unlock Challenges

SZ Heatsource 800 Optic and Crosshair

SZ Heatsource 800 Reticle View
Modern Warfare 3 - SZ Heatsource 800 Reticle View

SZ Heatsource 800 Compatible Guns

Guns That Can Use the Attachment
Modern Warfare 3 -Lockwood 300Lockwood 300 Modern Warfare 3 -EBR-14EBR-14 Modern Warfare 3 -SP-R 208SP-R 208
Modern Warfare 3 -Lockwood Mk2Lockwood Mk2 Modern Warfare 3 -LM-SLM-S Modern Warfare 3 -TAQ-MTAQ-M
Modern Warfare 3 -Tempus TorrentTempus Torrent Modern Warfare 3 -SA-B 50SA-B 50 Modern Warfare 3 -Signal 50Signal 50
Modern Warfare 3 -MCPR-300MCPR-300 Modern Warfare 3 -LA-B 330LA-B 330 Modern Warfare 3 -SP-X 80SP-X 80
Modern Warfare 3 -Carrack .300Carrack .300 Modern Warfare 3 -FJX ImperiumFJX Imperium Modern Warfare 3 -Victus XMRVictus XMR
Modern Warfare 3 -KV InhibitorKV Inhibitor Modern Warfare 3 -LongbowLongbow Modern Warfare 3 -KVD EnforcerKVD Enforcer
Modern Warfare 3 -DM56DM56 Modern Warfare 3 -KATT-AMRKATT-AMR Modern Warfare 3 -XRK StalkerXRK Stalker
Modern Warfare 3 -MORSMORS

Modern Warfare 3 (MW3) Related Guides

Modern Warfare 3 - Attachments

List of All Attachments

Attachment Types in MW3

Attachments By Type
Barrel Stock Ammunition Muzzle
Rear Grip Optic Underbarrel Magazine
Receiver Laser Comb Trigger Action
Guard Bolt Arm Rail
Carry Handle Lever Loader Wire
Conversion Kit

All Optic Attachments in MW3

All Related Attachments
Modern Warfare 3 -3X RFL-Optic3X RFL-Optic Modern Warfare 3 -6.3x-14x Carrack6.3x-14x Carrack Modern Warfare 3 -6X Short-Zoom Optic6X Short-Zoom Optic
Modern Warfare 3 -Aim Op-V4Aim Op-V4 Modern Warfare 3 -Akalina LR-Stalk OpticAkalina LR-Stalk Optic Modern Warfare 3 -Angel-40 4.8xAngel-40 4.8x
Modern Warfare 3 -AOK 4.0x RQ-9 ReconAOK 4.0x RQ-9 Recon Modern Warfare 3 -ARES Clear ShotARES Clear Shot AW Gen.1 Optic
Modern Warfare 3 -BPZ40 HybridBPZ40 Hybrid Modern Warfare 3 -Carrack .300 11xCarrack .300 11x Modern Warfare 3 -Caucasus Reflex SightCaucasus Reflex Sight
Modern Warfare 3 -Chrios HoloChrios Holo Modern Warfare 3 -Corio 13X VRSCorio 13X VRS Modern Warfare 3 -Corio CQC ScopeCorio CQC Scope
Modern Warfare 3 -Corio Eagleseye 2.5XCorio Eagleseye 2.5X Modern Warfare 3 -Corio ELT-10 2.5XCorio ELT-10 2.5X Modern Warfare 3 -Corio Enforcer OpticCorio Enforcer Optic
Modern Warfare 3 -Corio RE-X ProCorio RE-X Pro Modern Warfare 3 -Corio RV500Corio RV500 Modern Warfare 3 -Corio SZ-HS 800Corio SZ-HS 800
Modern Warfare 3 -Corvus Downrange-00Corvus Downrange-00 Modern Warfare 3 -Corvus GhostviewCorvus Ghostview Modern Warfare 3 -Corvus SOL-76Corvus SOL-76
Modern Warfare 3 -Cronen Intlas MSP-12Cronen Intlas MSP-12 Modern Warfare 3 -Cronen IronsCronen Irons Modern Warfare 3 -Cronen Mini DotCronen Mini Dot
Modern Warfare 3 -Cronen Mini ProCronen Mini Pro Modern Warfare 3 -Cronen Zero-P OpticCronen Zero-P Optic Modern Warfare 3 -Daunt-C80Daunt-C80
Modern Warfare 3 -Demonic CallDemonic Call Modern Warfare 3 -DF105 Reflex SightDF105 Reflex Sight Modern Warfare 3 -DR582 Hybrid SightDR582 Hybrid Sight
Modern Warfare 3 -DragonDragon's Eye Optic Modern Warfare 3 -Drexsom Prime-90Drexsom Prime-90 Modern Warfare 3 -DS Farsight 11DS Farsight 11
Modern Warfare 3 -DXS Coriolis V4DXS Coriolis V4 Modern Warfare 3 -Forge Tac Delta 4Forge Tac Delta 4 Modern Warfare 3 -FSS Spectre MicrothermFSS Spectre Microtherm
Modern Warfare 3 -FTac Charlie7FTac Charlie7 Modern Warfare 3 -FTac Locus SPFTac Locus SP Modern Warfare 3 -Heinrichter Hybrid ScopeHeinrichter Hybrid Scope
Modern Warfare 3 -HMW-20 OpticHMW-20 Optic Modern Warfare 3 -Holo-Craft OpticHolo-Craft Optic Modern Warfare 3 -Houndeye Integrated OpticHoundeye Integrated Optic
Modern Warfare 3 -Hurricane 9 Variable OpticHurricane 9 Variable Optic Modern Warfare 3 -Hybrid FirepointHybrid Firepoint Modern Warfare 3 -Imperium 12xImperium 12x
Modern Warfare 3 -Intlas CAS-14Intlas CAS-14 Modern Warfare 3 -JAK BullseyeJAK Bullseye JAK Glassless Optic
JAK NRG-IV Optic Modern Warfare 3 -Kazan-HoloKazan-Holo Modern Warfare 3 -KR Intlas LSJ-3KR Intlas LSJ-3
Modern Warfare 3 -KR Katt-50 8X ScopeKR Katt-50 8X Scope Modern Warfare 3 -KR Marauder 9 RiserKR Marauder 9 Riser Modern Warfare 3 -KR Minitac-40 RiserKR Minitac-40 Riser
Modern Warfare 3 -KR Mortis Precision 2.5XKR Mortis Precision 2.5X Modern Warfare 3 -KR V4 1X RiserKR V4 1X Riser Modern Warfare 3 -Lachmann Impact 9Lachmann Impact 9
Modern Warfare 3 -Luca Bandera ScopeLuca Bandera Scope Modern Warfare 3 -Luca Canis 4x OpticLuca Canis 4x Optic Modern Warfare 3 -Luca Field-6Luca Field-6
Modern Warfare 3 -MCPR-300 9.5xMCPR-300 9.5x Modern Warfare 3 -MK. 3 ReflectorMK. 3 Reflector Modern Warfare 3 -Monocle CT90Monocle CT90
MORS Dot Sight Modern Warfare 3 -Nydar Model 2023Nydar Model 2023 Modern Warfare 3 -QTG Reflex SightQTG Reflex Sight
Quarters Classic Reflex Modern Warfare 3 -Raptor-FVM40Raptor-FVM40 Modern Warfare 3 -Rhino ReflexRhino Reflex
Modern Warfare 3 -Schlager 3.4xSchlager 3.4x Modern Warfare 3 -Schlager Night ViewSchlager Night View Modern Warfare 3 -Sightmax Clear ShotSightmax Clear Shot
Modern Warfare 3 -Signal 50 8xSignal 50 8x Modern Warfare 3 -SL Truesight 2.5xSL Truesight 2.5x Modern Warfare 3 -Slate ReflectorSlate Reflector
Modern Warfare 3 -Slimline ProSlimline Pro Modern Warfare 3 -SP-X 80 6.6xSP-X 80 6.6x Modern Warfare 3 -SZ Aggressor-IR OpticSZ Aggressor-IR Optic
Modern Warfare 3 -SZ Battle OpticSZ Battle Optic Modern Warfare 3 -SZ Bullseye OpticSZ Bullseye Optic Modern Warfare 3 -SZ Heatsource 800SZ Heatsource 800
Modern Warfare 3 -SZ HM5 Precision Hybrid OpticSZ HM5 Precision Hybrid Optic Modern Warfare 3 -SZ HolothermSZ Holotherm Modern Warfare 3 -SZ Lonewolf OpticSZ Lonewolf Optic
Modern Warfare 3 -SZ MiniSZ Mini Modern Warfare 3 -SZ Minitac-40SZ Minitac-40 Modern Warfare 3 -SZ Oscar-9SZ Oscar-9
Modern Warfare 3 -SZ Recharge-DXSZ Recharge-DX Modern Warfare 3 -SZ Sigma-IV OpticSZ Sigma-IV Optic Modern Warfare 3 -SZ SRO-7SZ SRO-7
Modern Warfare 3 -SZ Ultra 11.5xSZ Ultra 11.5x Modern Warfare 3 -SZ Vortex-90SZ Vortex-90 Modern Warfare 3 -Teplo Clear ShotTeplo Clear Shot
Modern Warfare 3 -Teplo-OP3 ScopeTeplo-OP3 Scope Modern Warfare 3 -Thermo-Optic X9Thermo-Optic X9 Modern Warfare 3 -TOS Nightfall 2.5X Thermal OpticTOS Nightfall 2.5X Thermal Optic
TPS Incendio Reflex Modern Warfare 3 -TX4 HavocTX4 Havoc Modern Warfare 3 -Victus 13xVictus 13x
Modern Warfare 3 -Vigilant-30 C-IronVigilant-30 C-Iron Modern Warfare 3 -VLK 4.0 OpticVLK 4.0 Optic Modern Warfare 3 -VX350 Thermal OpticVX350 Thermal Optic
Modern Warfare 3 -XRK On-Point OpticXRK On-Point Optic Modern Warfare 3 -XRK StalkerXRK Stalker Modern Warfare 3 -XTEN Angel-40XTEN Angel-40
Modern Warfare 3 -XTen ERX-10 MiniXTen ERX-10 Mini Modern Warfare 3 -XTEN Intlas AS-7XTEN Intlas AS-7

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