Corvus OP-One v.4 attachment in MW4
The Corvus OP-One v.4 is a rear grip attachment (“Assault Grip”) that community sites list for one weapon: Signal 50. CODMunity lists a stat change on 1 of them; the largest is vertical recoil −6% on the Signal 50 (better). No popular build that CODMunity lists uses it.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the Corvus OP-One v.4
Activision publishes no compatibility list; 2 community sources report this weapon. No weapon level is reported.
| Weapon | Class | Weapon level | Stats with a listed change |
|---|---|---|---|
| Signal 50 | Sniper Rifle | vertical recoil (small, better), horizontal recoil (small, better), vertical gun kick (small, better), horizontal gun kick (small, better), sprint to fire speed (small, worse), ADS speed (minor, worse), and ADS out speed (minor, worse) |
What the Corvus OP-One v.4 changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| Signal 50 | Vertical recoil | 19.8 | 18.6 | −6% (better) |
| Horizontal recoil | 8.4 | 7.9 | −6% (better) | |
| Sprint to fire speed | 283 ms | 291 ms | +3% (worse) | |
| ADS speed | 590 ms | 602 ms | +2% (worse) |
Smaller changes are left out of the table: 3 other stats on the Signal 50.
How it ranks among rear grip attachments
Its largest change on each weapon, compared with the other rear grip attachments the source lists that stat for.
- Signal 50: its small vertical recoil change (better) is the best of 2 rear grip attachments.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the Corvus OP-One v.4
No popular build listed by CODMunity uses the Corvus OP-One v.4. That says nothing about how it performs; most listed attachments are in no popular build.
Frequently asked questions
What does the Corvus OP-One v.4 do in MW4?
CODMunity lists 7 stat changes for it across 1 weapon: 4 better and 3 worse. The largest is vertical recoil −6% on the Signal 50 (better).
Which weapons can use the Corvus OP-One v.4?
Community sites list Signal 50. Activision has not published a compatibility list.
Is the Corvus OP-One v.4 in a popular build?
No. None of the popular builds that CODMunity lists uses it.