SFO Proto-33 attachment in MW4
The SFO Proto-33 is a muzzle attachment (“Heavy Silencer”) that community sites list for 2 weapons: SANG 9mm and Krait P68. CODMunity lists a stat change on 2 of them; the largest is ADS speed +18% on the SANG 9mm (worse). It is in 2 popular builds that CODMunity lists.
Community-reportedDMZ Radar, ggranked, and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the SFO Proto-33
Activision publishes no compatibility list; 3 community sources report these 2 weapons. No weapon level is reported.
| Weapon | Class | Weapon level | Stats with a listed change |
|---|---|---|---|
| SANG 9mm | Pistol | ADS speed (large, worse), damage range (large, better), bullet velocity (large, better), ADS idle sway (large, worse), ADS gun bob (large, worse), ADS out speed (moderate, worse), vertical recoil (small, better), and horizontal recoil (small, better), and 7 more | |
| Krait P68 | Pistol | bullet velocity (large, better), damage range (large, better), ADS idle sway (large, worse), ADS gun bob (large, worse), ADS speed (moderate, worse), ADS out speed (moderate, worse), vertical recoil (small, better), and horizontal recoil (small, better), and 7 more |
What the SFO Proto-33 changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| SANG 9mm | ADS speed | 170 ms | 201 ms | +18% (worse) |
| Damage range | 100% | 118% | +18% (better) | |
| Bullet velocity | 370 m/s | 429 m/s | +16% (better) | |
| Vertical recoil | 41.6 | 39.1 | −6% (better) | |
| Horizontal recoil | 10.3 | 9.7 | −6% (better) | |
| Movement speed | 5.05 m/s | 4.95 m/s | −2% (worse) | |
| ADS movement speed | 3.73 m/s | 3.66 m/s | −2% (worse) | |
| Krait P68 | Bullet velocity | 250 m/s | 290 m/s | +16% (better) |
| Damage range | 100% | 116% | +16% (better) | |
| ADS speed | 180 ms | 200 ms | +11% (worse) | |
| Vertical recoil | 77.8 | 73.1 | −6% (better) | |
| Horizontal recoil | 54.5 | 51.2 | −6% (better) | |
| Movement speed | 4.99 m/s | 4.89 m/s | −2% (worse) | |
| ADS movement speed | 3.68 m/s | 3.61 m/s | −2% (worse) |
Smaller changes are left out of the table: 8 other stats on the SANG 9mm and 8 other stats on the Krait P68.
Changes across weapons
The stats it changes on 2 weapons, with the lowest and highest change.
| Stat | Weapons | Lowest change | Highest change | Verdicts |
|---|---|---|---|---|
| ADS speed | 2 | +11% | +18% | 0 better, 2 worse |
| Damage range | 2 | +16% | +18% | 2 better, 0 worse |
| Bullet velocity | 2 | +16% | +16% | 2 better, 0 worse |
| Horizontal recoil | 2 | −6% | −6% | 2 better, 0 worse |
| Vertical recoil | 2 | −6% | −6% | 2 better, 0 worse |
| ADS movement speed | 2 | −2% | −2% | 0 better, 2 worse |
| Movement speed | 2 | −2% | −2% | 0 better, 2 worse |
| ADS gun bob | 2 | +15% | +15% | 0 better, 2 worse |
| ADS idle sway | 2 | +15% | +15% | 0 better, 2 worse |
| ADS out speed | 2 | +10% | +11% | 0 better, 2 worse |
| Horizontal gun kick | 2 | −6% | −6% | 2 better, 0 worse |
| Vertical gun kick | 2 | −6% | −6% | 2 better, 0 worse |
| Crouch movement speed | 2 | −2% | −2% | 0 better, 2 worse |
| Firing movement speed | 2 | −2% | −2% | 0 better, 2 worse |
| Strafe speed | 2 | −2% | −2% | 0 better, 2 worse |
How it ranks among muzzle attachments
Its largest change on each weapon, compared with the other muzzle attachments the source lists that stat for.
- SANG 9mm: its large ADS speed change (worse) is the weakest of 5 muzzle attachments.
- Krait P68: its large bullet velocity change (better) is the only one listed.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the SFO Proto-33
CODMunity lists 2 popular builds that use it: 1 for Multiplayer and 1 for DMZ. The styles are Versatile and Close Range. The same builds also use barrel, trigger action, magazine, rear grip, and optic attachments.
| Weapon | Mode and style | Tier | Other attachments | Builder |
|---|---|---|---|---|
| Krait P68 | Multiplayer, Versatile | Contender | Barrel: Ballistarc GMA6 6", Trigger Action: P68 Tapper 9, Magazine: 15 Round Mag, and Rear Grip: MAGTAC .45 | Open in the builder: Krait P68, Versatile |
| SANG 9mm | DMZ, Close Range with Apex Attachment | Not tiered | Optic: Z-Dot 9, Barrel: TT CP-9mm Barrel, Magazine: 24 Round Mag, and Trigger Action: SANG Highmatch | Open in the builder: SANG 9mm, Close Range |
Builds are community-reported and unverified.
Frequently asked questions
What does the SFO Proto-33 do in MW4?
CODMunity lists 30 stat changes for it across 2 weapons: 12 better and 18 worse. The largest is ADS speed +18% on the SANG 9mm (worse).
Which weapons can use the SFO Proto-33?
Community sites list SANG 9mm and Krait P68. Activision has not published a compatibility list.
Is the SFO Proto-33 in a popular build?
Yes. CODMunity lists it in 2 popular builds, on Krait P68 and SANG 9mm.