LM Class 6 HBL attachment in MW4
The LM Class 6 HBL is a barrel attachment (“Heavy Barrel”) that community sites list for one weapon: MAR-9. CODMunity lists a stat change on 1 of them; the largest is vertical recoil −14% on the MAR-9 (better). It is in 1 popular build that CODMunity lists.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the LM Class 6 HBL
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 |
|---|---|---|---|
| MAR-9 | Marksman Rifle | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (moderate, worse), ADS out speed (moderate, worse), bullet velocity (moderate, better), and ADS movement speed (small, worse), and 6 more |
What the LM Class 6 HBL changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| MAR-9 | Vertical recoil | 62.0 | 53.3 | −14% (better) |
| Horizontal recoil | 14.9 | 12.8 | −14% (better) | |
| ADS speed | 330 ms | 360 ms | +9% (worse) | |
| Bullet velocity | 670 m/s | 724 m/s | +8% (better) | |
| ADS movement speed | 2.10 m/s | 1.99 m/s | −5% (worse) | |
| Movement speed | 4.41 m/s | 4.28 m/s | −3% (worse) | |
| Sprint speed | 5.93 m/s | 5.81 m/s | −2% (worse) |
Smaller changes are left out of the table: 7 other stats on the MAR-9.
How it ranks among barrel attachments
Its largest change on each weapon, compared with the other barrel attachments the source lists that stat for.
- MAR-9: its moderate vertical recoil change (better) is the best of 3 barrel attachments.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the LM Class 6 HBL
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 rear grip attachments.
| Weapon | Mode and style | Tier | Other attachments | Builder |
|---|---|---|---|---|
| MAR-9 | DMZ, Long Range | Not tiered | Optic: KV Corsac Holo, Muzzle: EXP Undertow Gen. 2, Magazine: 30 Round Mag, and Rear Grip: Schlager PLM-S9 | Open in the builder: MAR-9, Long Range |
Builds are community-reported and unverified.
Frequently asked questions
What does the LM Class 6 HBL do in MW4?
CODMunity lists 14 stat changes for it across 1 weapon: 5 better and 9 worse. The largest is vertical recoil −14% on the MAR-9 (better).
Which weapons can use the LM Class 6 HBL?
Community sites list MAR-9. Activision has not published a compatibility list.
Is the LM Class 6 HBL in a popular build?
Yes. CODMunity lists it in 1 popular build, on MAR-9.