FSS Crackdown attachment in MW4
The FSS Crackdown is a muzzle attachment (“Heavy Silencer”) that community sites list for 2 weapons: ISO Nightshade and VEL 46. CODMunity lists a stat change on 2 of them; the largest is damage range +18% on the VEL 46 (better). It is in 4 popular builds that CODMunity lists.
Community-reportedDMZ Radar, wzranked, ggranked, and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the FSS Crackdown
Activision publishes no compatibility list; 4 community sources report these 2 weapons. No weapon level is reported.
| Weapon | Class | Weapon level | Stats with a listed change |
|---|---|---|---|
| ISO Nightshade | SMG | bullet velocity (large, better), ADS idle sway (large, worse), ADS gun bob (large, worse), damage range (moderate, better), ADS speed (moderate, worse), ADS out speed (moderate, worse), vertical recoil (small, better), and horizontal recoil (small, better), and 7 more | |
| VEL 46 | SMG | damage range (large, better), bullet velocity (large, better), ADS idle sway (large, worse), ADS gun bob (large, worse), ADS speed (moderate, worse), ADS out speed (moderate, worse), vertical recoil (small, better), and horizontal recoil (small, better), and 7 more |
What the FSS Crackdown 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 | Bullet velocity | 530 m/s | 615 m/s | +16% (better) |
| Damage range | 100% | 114% | +14% (better) | |
| ADS speed | 240 ms | 271 ms | +13% (worse) | |
| Vertical recoil | 40.9 | 38.4 | −6% (better) | |
| Horizontal recoil | 13.3 | 12.5 | −6% (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) | |
| VEL 46 | Damage range | 100% | 118% | +18% (better) |
| Bullet velocity | 565 m/s | 655 m/s | +16% (better) | |
| ADS speed | 230 ms | 260 ms | +13% (worse) | |
| Vertical recoil | 39.6 | 37.2 | −6% (better) | |
| Horizontal recoil | 12.5 | 11.8 | −6% (better) | |
| Movement speed | 4.77 m/s | 4.67 m/s | −2% (worse) | |
| ADS movement speed | 3.22 m/s | 3.16 m/s | −2% (worse) |
Smaller changes are left out of the table: 8 other stats on the ISO Nightshade and 8 other stats on the VEL 46.
Changes across weapons
The stats it changes on 2 weapons, with the lowest and highest change.
| Stat | Weapons | Lowest change | Highest change | Verdicts |
|---|---|---|---|---|
| Damage range | 2 | +14% | +18% | 2 better, 0 worse |
| Bullet velocity | 2 | +16% | +16% | 2 better, 0 worse |
| ADS speed | 2 | +13% | +13% | 0 better, 2 worse |
| Horizontal recoil | 2 | −6% | −6% | 2 better, 0 worse |
| Vertical recoil | 2 | −6% | −6% | 2 better, 0 worse |
| ADS movement speed | 2 | −2% | −2% | 0 better, 2 worse |
| Movement speed | 2 | −2% | −2% | 0 better, 2 worse |
| ADS gun bob | 2 | +15% | +15% | 0 better, 2 worse |
| ADS idle sway | 2 | +15% | +15% | 0 better, 2 worse |
| ADS out speed | 2 | +10% | +12% | 0 better, 2 worse |
| Horizontal gun kick | 2 | −6% | −6% | 2 better, 0 worse |
| Vertical gun kick | 2 | −6% | −6% | 2 better, 0 worse |
| Crouch movement speed | 2 | −2% | −2% | 0 better, 2 worse |
| Firing movement speed | 2 | −2% | −2% | 0 better, 2 worse |
| Strafe speed | 2 | −2% | −2% | 0 better, 2 worse |
How it ranks among muzzle attachments
Its largest change on each weapon, compared with the other muzzle attachments the source lists that stat for.
- ISO Nightshade: its large bullet velocity change (better) is the only one listed.
- VEL 46: its large damage range change (better) is the best of 2 muzzle attachments.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the FSS Crackdown
CODMunity lists 4 popular builds that use it: 1 for Multiplayer and 3 for DMZ. The styles are Mobility and Close Range. The same builds also use barrel, rear grip, stock, laser, underbarrel, and magazine attachments.
| Weapon | Mode and style | Tier | Other attachments | Builder |
|---|---|---|---|---|
| VEL 46 | Multiplayer, Mobility | Meta | Barrel: RV-B v2 Barrel, Rear Grip: Sakin Rubber Grip, Stock: EXP U-Turn Stock, and Laser: Schlager VISIV-5 | Open in the builder: VEL 46, Mobility |
| VEL 46 | DMZ, Close Range with Apex Attachment | Not tiered | Barrel: VB-46 Series 11, Underbarrel: FSS Fireline Grip, Magazine: 60 Round Drum, and Laser: Schlager VISIV-5 | Open in the builder: VEL 46, Close Range |
| VEL 46 | DMZ, Close Range | Not tiered | Barrel: VB-46 Series 11, Magazine: 60 Round Drum, Rear Grip: Sakin Rubber Grip, and Stock: EXP U-Turn Stock | Open in the builder: VEL 46, Close Range |
| ISO Nightshade | DMZ, Close Range with Apex Attachment | Not tiered | Barrel: ZLR Carbon-900, 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 FSS Crackdown do in MW4?
CODMunity lists 30 stat changes for it across 2 weapons: 12 better and 18 worse. The largest is damage range +18% on the VEL 46 (better).
Which weapons can use the FSS Crackdown?
Community sites list ISO Nightshade and VEL 46. Activision has not published a compatibility list.
Is the FSS Crackdown in a popular build?
Yes. CODMunity lists it in 4 popular builds, on VEL 46 and ISO Nightshade.