FSS Phosphor 40 attachment in MW4
The FSS Phosphor 40 is a laser attachment (“Dim Hip Laser”) that community sites list for 3 weapons: Krait P68, .50 GS, and Mojave .357. CODMunity lists a stat change on 1 of them; the largest is hip idle sway −7% on the Mojave .357 (better). No popular build that CODMunity lists uses it.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the FSS Phosphor 40
Activision publishes no compatibility list; 2 community sources report these 3 weapons. No weapon level is reported.
| Weapon | Class | Weapon level | Stats with a listed change |
|---|---|---|---|
| Krait P68 | Pistol | No change listed | |
| .50 GS | Pistol | No change listed | |
| Mojave .357 | Pistol | hip idle sway (small, better) and hip gun bob (small, better) |
What the FSS Phosphor 40 changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| Mojave .357 | Hip idle sway | 2.22° | 2.06° | −7% (better) |
| Hip gun bob | 1.49° | 1.39° | −7% (better) |
CODMunity lists no stat change for the Krait P68 and .50 GS.
How it ranks among laser attachments
Its largest change on each weapon, compared with the other laser attachments the source lists that stat for.
- Mojave .357: its small hip idle sway 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 FSS Phosphor 40
No popular build listed by CODMunity uses the FSS Phosphor 40. That says nothing about how it performs; most listed attachments are in no popular build.
Frequently asked questions
What does the FSS Phosphor 40 do in MW4?
CODMunity lists 2 stat changes for it across 1 weapon: 2 better and 0 worse. The largest is hip idle sway −7% on the Mojave .357 (better).
Which weapons can use the FSS Phosphor 40?
Community sites list Krait P68, .50 GS, and Mojave .357. Activision has not published a compatibility list.
Is the FSS Phosphor 40 in a popular build?
No. None of the popular builds that CODMunity lists uses it.