M357 Heavy attachment in MW4
The M357 Heavy is a trigger action attachment (“Heavy Trigger”) that community sites list for one weapon: Mojave .357. CODMunity lists a stat change on 1 of them; the largest is fire rate −11% on the Mojave .357 (worse). No popular build that CODMunity lists uses it.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the M357 Heavy
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 |
|---|---|---|---|
| Mojave .357 | Pistol | fire rate (moderate, worse), sprint to fire speed (small, better), ADS speed (small, better), and ADS out speed (small, better) |
What the M357 Heavy 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 | Fire rate | 141 rpm | 125 rpm | −11% (worse) |
| Sprint to fire speed | 80 ms | 76 ms | −5% (better) | |
| ADS speed | 190 ms | 182 ms | −4% (better) |
Smaller changes are left out of the table: 1 other stat on the Mojave .357.
How it ranks among trigger action attachments
Its largest change on each weapon, compared with the other trigger action attachments the source lists that stat for.
- Mojave .357: its moderate fire rate change (worse) is the weakest of 3 trigger action attachments.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the M357 Heavy
No popular build listed by CODMunity uses the M357 Heavy. That says nothing about how it performs; most listed attachments are in no popular build.
Frequently asked questions
What does the M357 Heavy do in MW4?
CODMunity lists 4 stat changes for it across 1 weapon: 3 better and 1 worse. The largest is fire rate −11% on the Mojave .357 (worse).
Which weapons can use the M357 Heavy?
Community sites list Mojave .357. Activision has not published a compatibility list.
Is the M357 Heavy in a popular build?
No. None of the popular builds that CODMunity lists uses it.