GL Block-12 attachment in MW4
The GL Block-12 is a barrel attachment (“Long Barrel”) that community sites list for one weapon: Oden. CODMunity lists a stat change on 1 of them; the largest is damage range +25% on the Oden (better). No popular build that CODMunity lists uses it.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the GL Block-12
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 |
|---|---|---|---|
| Oden | Assault Rifle | 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 crouch movement speed (small, worse), and 10 more |
What the GL Block-12 changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| Oden | Damage range | 100% | 125% | +25% (better) |
| Bullet velocity | 690 m/s | 828 m/s | +20% (better) | |
| ADS speed | 320 ms | 342 ms | +7% (worse) | |
| Sprint to fire speed | 210 ms | 223 ms | +6% (worse) | |
| Movement speed | 4.46 m/s | 4.33 m/s | −3% (worse) | |
| ADS movement speed | 2.18 m/s | 2.11 m/s | −3% (worse) | |
| Vertical recoil | 49.4 | 47.9 | −3% (better) | |
| Horizontal recoil | 15.2 | 14.7 | −3% (better) | |
| Sprint speed | 6.03 m/s | 5.97 m/s | −1% (worse) |
Smaller changes are left out of the table: 9 other stats on the Oden.
How it ranks among barrel attachments
Its largest change on each weapon, compared with the other barrel attachments the source lists that stat for.
- Oden: its large damage range 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 GL Block-12
No popular build listed by CODMunity uses the GL Block-12. That says nothing about how it performs; most listed attachments are in no popular build.
Frequently asked questions
What does the GL Block-12 do in MW4?
CODMunity lists 18 stat changes for it across 1 weapon: 6 better and 12 worse. The largest is damage range +25% on the Oden (better).
Which weapons can use the GL Block-12?
Community sites list Oden. Activision has not published a compatibility list.
Is the GL Block-12 in a popular build?
No. None of the popular builds that CODMunity lists uses it.