TA Sustain-99 20" attachment in MW4
The TA Sustain-99 20" is a barrel attachment (“Heavy Long Barrel”) that community sites list for one weapon: FiNN LMG. CODMunity lists a stat change on 1 of them; the largest is bullet velocity +15% on the FiNN LMG (better). No popular build that CODMunity lists uses it.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the TA Sustain-99 20"
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 |
|---|---|---|---|
| FiNN LMG | LMG | bullet velocity (large, better), damage range (moderate, better), vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS movement speed (moderate, worse), and ADS speed (moderate, worse), and 11 more |
What the TA Sustain-99 20" 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 | Bullet velocity | 710 m/s | 816 m/s | +15% (better) |
| Damage range | 100% | 114% | +14% (better) | |
| Vertical recoil | 49.0 | 44.1 | −10% (better) | |
| Horizontal recoil | 17.3 | 15.6 | −10% (better) | |
| ADS movement speed | 2.03 m/s | 1.87 m/s | −8% (worse) | |
| ADS speed | 400 ms | 432 ms | +8% (worse) | |
| Movement speed | 4.38 m/s | 4.20 m/s | −4% (worse) | |
| Sprint to fire speed | 237 ms | 246 ms | +4% (worse) | |
| Sprint speed | 5.82 m/s | 5.65 m/s | −3% (worse) |
Smaller changes are left out of the table: 10 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 bullet velocity change (better) is in the lower half of 3 barrel attachments.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the TA Sustain-99 20"
No popular build listed by CODMunity uses the TA Sustain-99 20". That says nothing about how it performs; most listed attachments are in no popular build.
Frequently asked questions
What does the TA Sustain-99 20" do in MW4?
CODMunity lists 19 stat changes for it across 1 weapon: 6 better and 13 worse. The largest is bullet velocity +15% on the FiNN LMG (better).
Which weapons can use the TA Sustain-99 20"?
Community sites list FiNN LMG. Activision has not published a compatibility list.
Is the TA Sustain-99 20" in a popular build?
No. None of the popular builds that CODMunity lists uses it.