770 Underbite attachment in MW4
The 770 Underbite is a muzzle attachment (“Breacher”) that community sites list for 4 weapons: Kastov 762, Type 73, Mosin-Nagant, and KG-7 Vulcan. CODMunity lists a stat change on 2 of them; the largest is damage range +2% on the Kastov 762 (better). No popular build that CODMunity lists uses it.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the 770 Underbite
Activision publishes no compatibility list; 2 community sources report these 4 weapons. No weapon level is reported.
| Weapon | Class | Weapon level | Stats with a listed change |
|---|---|---|---|
| Kastov 762 | Assault Rifle | damage range (minor, better) | |
| Type 73 | LMG | No change listed | |
| Mosin-Nagant | Marksman Rifle | damage range (minor, better) | |
| KG-7 Vulcan | Sniper Rifle | No change listed |
What the 770 Underbite changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| Kastov 762 | Damage range | 100% | 102% | +2% (better) |
| Mosin-Nagant | Damage range | 100% | 102% | +2% (better) |
CODMunity lists no stat change for the Type 73 and KG-7 Vulcan.
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 | +2% | +2% | 2 better, 0 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.
- Kastov 762: its minor damage range change (better) is in the lower half of 3 muzzle attachments.
- Mosin-Nagant: its minor damage range change (better) is in the lower half of 3 muzzle attachments.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the 770 Underbite
No popular build listed by CODMunity uses the 770 Underbite. That says nothing about how it performs; most listed attachments are in no popular build.
Frequently asked questions
What does the 770 Underbite do in MW4?
CODMunity lists 2 stat changes for it across 2 weapons: 2 better and 0 worse. The largest is damage range +2% on the Kastov 762 (better).
Which weapons can use the 770 Underbite?
Community sites list Kastov 762, Type 73, Mosin-Nagant, and KG-7 Vulcan. Activision has not published a compatibility list.
Is the 770 Underbite in a popular build?
No. None of the popular builds that CODMunity lists uses it.