ZLR Carbon-900 attachment in MW4
The ZLR Carbon-900 is a barrel attachment (“Long Barrel”) that community sites list for one weapon: ISO Nightshade. CODMunity lists a stat change on 1 of them; the largest is damage range +23% on the ISO Nightshade (better). It is in 1 popular build that CODMunity lists.
Community-reportedDMZ Radar, wzranked, ggranked, and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the ZLR Carbon-900
Activision publishes no compatibility list; 4 community sources report this weapon. No weapon level is reported.
| Weapon | Class | Weapon level | Stats with a listed change |
|---|---|---|---|
| ISO Nightshade | SMG | damage range (large, better), bullet velocity (large, better), ADS speed (moderate, worse), ADS out speed (moderate, worse), sprint to fire speed (moderate, worse), ADS idle sway (moderate, worse), hip idle sway (moderate, worse), and vertical recoil (small, better), and 10 more |
What the ZLR Carbon-900 changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| ISO Nightshade | Damage range | 100% | 123% | +23% (better) |
| Bullet velocity | 530 m/s | 625 m/s | +18% (better) | |
| ADS speed | 240 ms | 271 ms | +13% (worse) | |
| Sprint to fire speed | 110 ms | 120 ms | +9% (worse) | |
| Vertical recoil | 40.9 | 39.3 | −4% (better) | |
| Horizontal recoil | 13.3 | 12.8 | −4% (better) | |
| Movement speed | 4.80 m/s | 4.70 m/s | −2% (worse) | |
| ADS movement speed | 3.20 m/s | 3.14 m/s | −2% (worse) | |
| Sprint speed | 6.33 m/s | 6.27 m/s | −1% (worse) |
Smaller changes are left out of the table: 9 other stats on the ISO Nightshade.
How it ranks among barrel attachments
Its largest change on each weapon, compared with the other barrel attachments the source lists that stat for.
- ISO Nightshade: its large damage range change (better) is the best of 2 barrel attachments.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the ZLR Carbon-900
CODMunity lists 1 popular build that use it, all for DMZ. The styles are Close Range. The same builds also use muzzle, magazine, rear grip, and laser attachments.
| Weapon | Mode and style | Tier | Other attachments | Builder |
|---|---|---|---|---|
| ISO Nightshade | DMZ, Close Range with Apex Attachment | Not tiered | Muzzle: FSS Crackdown, Magazine: 50 Round Drum Mag, Rear Grip: Demo STP-1, and Laser: Schlager VISIV-5 | Open in the builder: ISO Nightshade, Close Range |
Builds are community-reported and unverified.
Frequently asked questions
What does the ZLR Carbon-900 do in MW4?
CODMunity lists 18 stat changes for it across 1 weapon: 6 better and 12 worse. The largest is damage range +23% on the ISO Nightshade (better).
Which weapons can use the ZLR Carbon-900?
Community sites list ISO Nightshade. Activision has not published a compatibility list.
Is the ZLR Carbon-900 in a popular build?
Yes. CODMunity lists it in 1 popular build, on ISO Nightshade.