NK Retribution-X Barrel attachment in MW4
The NK Retribution-X Barrel is a barrel attachment (“Heavy Barrel”) that community sites list for one weapon: Warlord. CODMunity lists a stat change on 1 of them; the largest is vertical recoil −14% on the Warlord (better). No popular build that CODMunity lists uses it.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the NK Retribution-X Barrel
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 |
|---|---|---|---|
| Warlord | Shotgun | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (moderate, worse), ADS out speed (moderate, worse), bullet velocity (moderate, better), and movement speed (small, worse), and 6 more |
What the NK Retribution-X Barrel changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| Warlord | Vertical recoil | 79.9 | 68.7 | −14% (better) |
| Horizontal recoil | 29.1 | 25.0 | −14% (better) | |
| ADS speed | 340 ms | 371 ms | +9% (worse) | |
| Bullet velocity | 325 m/s | 351 m/s | +8% (better) | |
| Movement speed | 4.55 m/s | 4.41 m/s | −3% (worse) | |
| ADS movement speed | 2.93 m/s | 2.84 m/s | −3% (worse) | |
| Sprint speed | 6.11 m/s | 5.99 m/s | −2% (worse) |
Smaller changes are left out of the table: 7 other stats on the Warlord.
How it ranks among barrel attachments
Its largest change on each weapon, compared with the other barrel attachments the source lists that stat for.
- Warlord: its moderate vertical recoil change (better) is the best of 3 barrel attachments.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the NK Retribution-X Barrel
No popular build listed by CODMunity uses the NK Retribution-X Barrel. That says nothing about how it performs; most listed attachments are in no popular build.
Frequently asked questions
What does the NK Retribution-X Barrel do in MW4?
CODMunity lists 14 stat changes for it across 1 weapon: 5 better and 9 worse. The largest is vertical recoil −14% on the Warlord (better).
Which weapons can use the NK Retribution-X Barrel?
Community sites list Warlord. Activision has not published a compatibility list.
Is the NK Retribution-X Barrel in a popular build?
No. None of the popular builds that CODMunity lists uses it.