TT Seongun 508mm attachment in MW4
The TT Seongun 508mm is a barrel attachment (“Long Barrel”) that community sites list for one weapon: FiNN LMG. CODMunity lists a stat change on 1 of them; the largest is damage range +24% on the FiNN LMG (better). It is in 1 popular build that CODMunity lists.
Community-reportedDMZ Radar, ggranked, and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the TT Seongun 508mm
Activision publishes no compatibility list; 3 community sources report this weapon. No weapon level is reported.
| Weapon | Class | Weapon level | Stats with a listed change |
|---|---|---|---|
| FiNN LMG | LMG | damage range (large, better), bullet velocity (large, better), ADS idle sway (moderate, worse), hip idle sway (moderate, worse), ADS speed (small, worse), ADS out speed (small, worse), sprint to fire speed (small, worse), and ADS movement speed (small, worse), and 10 more |
What the TT Seongun 508mm changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| FiNN LMG | Damage range | 100% | 124% | +24% (better) |
| Bullet velocity | 710 m/s | 852 m/s | +20% (better) | |
| ADS speed | 400 ms | 428 ms | +7% (worse) | |
| Sprint to fire speed | 237 ms | 251 ms | +6% (worse) | |
| ADS movement speed | 2.03 m/s | 1.95 m/s | −4% (worse) | |
| Vertical recoil | 49.0 | 47.0 | −4% (better) | |
| Horizontal recoil | 17.3 | 16.6 | −4% (better) | |
| Movement speed | 4.38 m/s | 4.25 m/s | −3% (worse) | |
| Sprint speed | 5.82 m/s | 5.76 m/s | −1% (worse) |
Smaller changes are left out of the table: 9 other stats on the FiNN LMG.
How it ranks among barrel attachments
Its largest change on each weapon, compared with the other barrel attachments the source lists that stat for.
- FiNN LMG: its large damage range change (better) is the best of 2 barrel attachments.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the TT Seongun 508mm
CODMunity lists 1 popular build that use it, all for DMZ. The styles are Long Range. The same builds also use optic, muzzle, magazine, and stock attachments.
| Weapon | Mode and style | Tier | Other attachments | Builder |
|---|---|---|---|---|
| FiNN LMG | DMZ, Long Range | Not tiered | Optic: KV Corsac Holo, Muzzle: FSS IS300, Magazine: 150 Round Box Mag, and Stock: Hanbit Tech50 Gen.5 | Open in the builder: FiNN LMG, Long Range |
Builds are community-reported and unverified.
Frequently asked questions
What does the TT Seongun 508mm do in MW4?
CODMunity lists 18 stat changes for it across 1 weapon: 6 better and 12 worse. The largest is damage range +24% on the FiNN LMG (better).
Which weapons can use the TT Seongun 508mm?
Community sites list FiNN LMG. Activision has not published a compatibility list.
Is the TT Seongun 508mm in a popular build?
Yes. CODMunity lists it in 1 popular build, on FiNN LMG.