Corio 4DV-3 attachment in MW4
The Corio 4DV-3 is a laser attachment (“Flashlight”) that community sites list for 8 weapons: M4, Hyeon Burst, Patriot XMR, Cronen Squall, and Warlord and 3 more. CODMunity lists a stat change on 8 of them; the largest is ADS movement speed +3% on the FiNN LMG (better). No popular build that CODMunity lists uses it.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the Corio 4DV-3
Activision publishes no compatibility list; 2 community sources report these 8 weapons. No weapon level is reported.
| Weapon | Class | Weapon level | Stats with a listed change |
|---|---|---|---|
| M4 | Assault Rifle | ADS idle sway (large, better), ADS gun bob (large, better), hip gun bob (moderate, better), movement speed (minor, better), ADS movement speed (minor, better), crouch movement speed (minor, better), strafe speed (minor, better), and firing movement speed (minor, better) | |
| Hyeon Burst | Assault Rifle | ADS idle sway (large, better), ADS gun bob (large, better), hip gun bob (moderate, better), movement speed (minor, better), ADS movement speed (minor, better), crouch movement speed (minor, better), strafe speed (minor, better), and firing movement speed (minor, better) | |
| Patriot XMR | Assault Rifle | ADS idle sway (large, better), ADS gun bob (large, better), hip gun bob (moderate, better), movement speed (minor, better), ADS movement speed (minor, better), crouch movement speed (minor, better), strafe speed (minor, better), and firing movement speed (minor, better) | |
| Cronen Squall | Assault Rifle | ADS idle sway (large, better), ADS gun bob (large, better), hip gun bob (moderate, better), movement speed (minor, better), ADS movement speed (minor, better), crouch movement speed (minor, better), strafe speed (minor, better), and firing movement speed (minor, better) | |
| Warlord | Shotgun | ADS idle sway (large, better), ADS gun bob (large, better), hip gun bob (moderate, better), movement speed (minor, better), ADS movement speed (minor, better), crouch movement speed (minor, better), strafe speed (minor, better), and firing movement speed (minor, better) | |
| FiNN LMG | LMG | ADS idle sway (large, better), ADS gun bob (large, better), hip gun bob (moderate, better), ADS movement speed (small, better), crouch movement speed (small, better), movement speed (minor, better), strafe speed (minor, better), and firing movement speed (minor, better) | |
| APOC-338 | LMG | ADS idle sway (large, better), ADS gun bob (large, better), hip gun bob (moderate, better), ADS movement speed (small, better), crouch movement speed (small, better), movement speed (minor, better), strafe speed (minor, better), and firing movement speed (minor, better) | |
| MAR-9 | Marksman Rifle | ADS idle sway (large, better), ADS gun bob (large, better), hip gun bob (moderate, better), movement speed (minor, better), ADS movement speed (minor, better), crouch movement speed (minor, better), strafe speed (minor, better), and firing movement speed (minor, better) |
What the Corio 4DV-3 changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| M4 | Movement speed | 4.70 m/s | 4.79 m/s | +2% (better) |
| ADS movement speed | 2.51 m/s | 2.56 m/s | +2% (better) | |
| Hyeon Burst | Movement speed | 4.58 m/s | 4.67 m/s | +2% (better) |
| ADS movement speed | 2.36 m/s | 2.41 m/s | +2% (better) | |
| Patriot XMR | Movement speed | 4.54 m/s | 4.63 m/s | +2% (better) |
| ADS movement speed | 2.22 m/s | 2.26 m/s | +2% (better) | |
| Cronen Squall | Movement speed | 4.55 m/s | 4.64 m/s | +2% (better) |
| ADS movement speed | 2.24 m/s | 2.28 m/s | +2% (better) | |
| Warlord | Movement speed | 4.55 m/s | 4.64 m/s | +2% (better) |
| ADS movement speed | 2.93 m/s | 2.99 m/s | +2% (better) | |
| FiNN LMG | ADS movement speed | 2.03 m/s | 2.09 m/s | +3% (better) |
| Movement speed | 4.38 m/s | 4.47 m/s | +2% (better) | |
| APOC-338 | ADS movement speed | 1.51 m/s | 1.56 m/s | +3% (better) |
| Movement speed | 4.05 m/s | 4.13 m/s | +2% (better) | |
| MAR-9 | Movement speed | 4.41 m/s | 4.50 m/s | +2% (better) |
| ADS movement speed | 2.10 m/s | 2.14 m/s | +2% (better) |
Smaller changes are left out of the table: 6 other stats on the M4, 6 other stats on the Hyeon Burst, 6 other stats on the Patriot XMR, 6 other stats on the Cronen Squall, 6 other stats on the Warlord, 6 other stats on the FiNN LMG, 6 other stats on the APOC-338, and 6 other stats on the MAR-9.
Changes across weapons
The stats it changes on 8 weapons, with the lowest and highest change.
| Stat | Weapons | Lowest change | Highest change | Verdicts |
|---|---|---|---|---|
| ADS movement speed | 8 | +2% | +3% | 8 better, 0 worse |
| Movement speed | 8 | +2% | +2% | 8 better, 0 worse |
| ADS idle sway | 8 | −40% | −40% | 8 better, 0 worse |
| ADS gun bob | 8 | −25% | −25% | 8 better, 0 worse |
| Hip gun bob | 8 | −10% | −10% | 8 better, 0 worse |
| Crouch movement speed | 8 | +2% | +3% | 8 better, 0 worse |
| Firing movement speed | 8 | +2% | +2% | 8 better, 0 worse |
| Strafe speed | 8 | +2% | +2% | 8 better, 0 worse |
How it ranks among laser attachments
Its largest change on each weapon, compared with the other laser attachments the source lists that stat for.
- M4: its minor movement speed change (better) is the best of 2 laser attachments.
- Hyeon Burst: its minor movement speed change (better) is the only one listed.
- Patriot XMR: its minor movement speed change (better) is the only one listed.
- Cronen Squall: its minor movement speed change (better) is the only one listed.
- Warlord: its minor movement speed change (better) is the only one listed.
- FiNN LMG: its small ADS movement speed change (better) is the only one listed.
- APOC-338: its small ADS movement speed change (better) is the only one listed.
- MAR-9: its minor movement speed change (better) is the only one listed.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the Corio 4DV-3
No popular build listed by CODMunity uses the Corio 4DV-3. That says nothing about how it performs; most listed attachments are in no popular build.
Frequently asked questions
What does the Corio 4DV-3 do in MW4?
CODMunity lists 64 stat changes for it across 8 weapons: 64 better and 0 worse. The largest is ADS movement speed +3% on the FiNN LMG (better).
Which weapons can use the Corio 4DV-3?
Community sites list M4, Hyeon Burst, Patriot XMR, Cronen Squall, Warlord, FiNN LMG, APOC-338, and MAR-9. Activision has not published a compatibility list.
Is the Corio 4DV-3 in a popular build?
No. None of the popular builds that CODMunity lists uses it.