.300 BLK Overpressured attachment in MW4
The .300 BLK Overpressured is a ammunition attachment that community sites list for one weapon: Axion. CODMunity lists a stat change on 1 of them; the largest is bullet penetration −30% on the Axion (worse). It is in 2 popular builds that CODMunity lists.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the .300 BLK Overpressured
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 |
|---|---|---|---|
| Axion | Assault Rifle | bullet penetration (large, worse) |
What the .300 BLK Overpressured changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| Axion | Bullet penetration | 9.0 in | 6.3 in | −30% (worse) |
How it ranks among ammunition attachments
Its largest change on each weapon, compared with the other ammunition attachments the source lists that stat for.
- Axion: its large bullet penetration change (worse) is the weakest of 2 ammunition attachments.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the .300 BLK Overpressured
CODMunity lists 2 popular builds that use it: 1 for Multiplayer and 1 for DMZ. The styles are Apex Attachment. The same builds also use muzzle, barrel, and magazine attachments.
| Weapon | Mode and style | Tier | Other attachments | Builder |
|---|---|---|---|---|
| Axion | Multiplayer, Apex Attachment with Apex Attachment | Viable | Muzzle: FSS IS300, Barrel: XRK 09-RTAC Pro, and Magazine: 100 Round Drum | Open in the builder: Axion, Apex Attachment |
| Axion | DMZ, Apex Attachment with Apex Attachment | Not tiered | Muzzle: FSS IS300, Barrel: XRK 09-RTAC Pro, and Magazine: 100 Round Drum | Open in the builder: Axion, Apex Attachment |
Builds are community-reported and unverified.
Frequently asked questions
What does the .300 BLK Overpressured do in MW4?
CODMunity lists 1 stat change for it across 1 weapon: 0 better and 1 worse. The largest is bullet penetration −30% on the Axion (worse).
Which weapons can use the .300 BLK Overpressured?
Community sites list Axion. Activision has not published a compatibility list.
Is the .300 BLK Overpressured in a popular build?
Yes. CODMunity lists it in 2 popular builds, on Axion.