RSS-40F 12" attachment in MW4
The RSS-40F 12" is a barrel attachment (“Short Barrel”) that community sites list for one weapon: Type 73. CODMunity lists a stat change on 1 of them; the largest is bullet velocity −14% on the Type 73 (worse). It is in 1 popular build that CODMunity lists.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the RSS-40F 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 |
|---|---|---|---|
| Type 73 | LMG | bullet velocity (moderate, worse), damage range (moderate, worse), ADS idle sway (moderate, better), hip idle sway (moderate, better), ADS speed (moderate, better), ADS out speed (moderate, better), sprint to fire speed (moderate, better), and vertical recoil (moderate, worse), and 11 more |
What the RSS-40F 12" changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| Type 73 | Bullet velocity | 690 m/s | 593 m/s | −14% (worse) |
| Damage range | 100% | 88% | −12% (worse) | |
| ADS speed | 460 ms | 423 ms | −8% (better) | |
| Sprint to fire speed | 245 ms | 225 ms | −8% (better) | |
| Vertical recoil | 42.1 | 45.5 | +8% (worse) | |
| Horizontal recoil | 10.5 | 11.3 | +8% (worse) | |
| Movement speed | 4.33 m/s | 4.59 m/s | +6% (better) | |
| ADS movement speed | 1.81 m/s | 1.88 m/s | +4% (better) | |
| Sprint speed | 5.71 m/s | 5.77 m/s | +1% (better) |
Smaller changes are left out of the table: 10 other stats on the Type 73.
How it ranks among barrel attachments
Its largest change on each weapon, compared with the other barrel attachments the source lists that stat for.
- Type 73: its moderate bullet velocity change (worse) is the weakest of 3 barrel attachments.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the RSS-40F 12"
CODMunity lists 1 popular build that use it, all for Multiplayer. The styles are Versatile. The same builds also use muzzle, rear grip, stock, and laser attachments.
| Weapon | Mode and style | Tier | Other attachments | Builder |
|---|---|---|---|---|
| Type 73 | Multiplayer, Versatile | Very good | Muzzle: Ivanov QR600, Rear Grip: Assault-L5 Grip, Stock: FTAC RZR0 Stock, and Laser: XRK Clutch-LS | Open in the builder: Type 73, Versatile |
Builds are community-reported and unverified.
Frequently asked questions
What does the RSS-40F 12" do in MW4?
CODMunity lists 19 stat changes for it across 1 weapon: 13 better and 6 worse. The largest is bullet velocity −14% on the Type 73 (worse).
Which weapons can use the RSS-40F 12"?
Community sites list Type 73. Activision has not published a compatibility list.
Is the RSS-40F 12" in a popular build?
Yes. CODMunity lists it in 1 popular build, on Type 73.