BCS-K 589mm Barrel attachment in MW4
The BCS-K 589mm Barrel is a barrel attachment (“Long Barrel”) that community sites list for one weapon: Kastov 762. CODMunity lists a stat change on 1 of them; the largest is damage range +25% on the Kastov 762 (better). It is in 1 popular build that CODMunity lists.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the BCS-K 589mm Barrel
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 |
|---|---|---|---|
| Kastov 762 | Assault Rifle | damage range (large, better), bullet velocity (large, better), ADS speed (moderate, worse), ADS idle sway (moderate, worse), hip idle sway (moderate, worse), ADS out speed (small, worse), sprint to fire speed (small, worse), and crouch movement speed (small, worse), and 6 more |
What the BCS-K 589mm Barrel changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| Kastov 762 | Damage range | 100% | 125% | +25% (better) |
| Bullet velocity | 560 m/s | 672 m/s | +20% (better) | |
| ADS speed | 280 ms | 305 ms | +9% (worse) | |
| Sprint to fire speed | 210 ms | 225 ms | +7% (worse) | |
| Movement speed | 4.52 m/s | 4.38 m/s | −3% (worse) | |
| ADS movement speed | 2.34 m/s | 2.27 m/s | −3% (worse) | |
| Sprint speed | 6.05 m/s | 5.99 m/s | −1% (worse) |
Smaller changes are left out of the table: 7 other stats on the Kastov 762.
How it ranks among barrel attachments
Its largest change on each weapon, compared with the other barrel attachments the source lists that stat for.
- Kastov 762: 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 BCS-K 589mm Barrel
CODMunity lists 1 popular build that use it, all for DMZ. The styles are Long Range. The same builds also use optic, muzzle, underbarrel, and magazine attachments.
| Weapon | Mode and style | Tier | Other attachments | Builder |
|---|---|---|---|---|
| Kastov 762 | DMZ, Long Range | Not tiered | Optic: KV Corsac Holo, Muzzle: Gauge-12 Mono, Underbarrel: FSS Fireline Grip, and Magazine: 75 Round Drum Mag 7.62 | Open in the builder: Kastov 762, Long Range |
Builds are community-reported and unverified.
Frequently asked questions
What does the BCS-K 589mm Barrel do in MW4?
CODMunity lists 14 stat changes for it across 1 weapon: 2 better and 12 worse. The largest is damage range +25% on the Kastov 762 (better).
Which weapons can use the BCS-K 589mm Barrel?
Community sites list Kastov 762. Activision has not published a compatibility list.
Is the BCS-K 589mm Barrel in a popular build?
Yes. CODMunity lists it in 1 popular build, on Kastov 762.