XRK Doc-40 6" attachment in MW4
The XRK Doc-40 6" is a barrel attachment (“Heavy Barrel”) that community sites list for one weapon: Krait P68. CODMunity lists a stat change on 1 of them; the largest is vertical recoil −14% on the Krait P68 (better). No popular build that CODMunity lists uses it.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the XRK Doc-40 6"
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 |
|---|---|---|---|
| Krait P68 | Pistol | 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 XRK Doc-40 6" changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| Krait P68 | Vertical recoil | 77.8 | 66.9 | −14% (better) |
| Horizontal recoil | 54.5 | 46.9 | −14% (better) | |
| ADS speed | 180 ms | 200 ms | +11% (worse) | |
| Bullet velocity | 250 m/s | 270 m/s | +8% (better) | |
| ADS movement speed | 3.68 m/s | 3.57 m/s | −3% (worse) | |
| Movement speed | 4.99 m/s | 4.89 m/s | −2% (worse) | |
| Sprint speed | 6.58 m/s | 6.45 m/s | −2% (worse) |
Smaller changes are left out of the table: 7 other stats on the Krait P68.
How it ranks among barrel attachments
Its largest change on each weapon, compared with the other barrel attachments the source lists that stat for.
- Krait P68: 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 XRK Doc-40 6"
No popular build listed by CODMunity uses the XRK Doc-40 6". That says nothing about how it performs; most listed attachments are in no popular build.
Frequently asked questions
What does the XRK Doc-40 6" 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 Krait P68 (better).
Which weapons can use the XRK Doc-40 6"?
Community sites list Krait P68. Activision has not published a compatibility list.
Is the XRK Doc-40 6" in a popular build?
No. None of the popular builds that CODMunity lists uses it.