The FSS Fireline Grip is a underbarrel attachment (“Angled grip”) that community sites list for 19 weapons: Han 86, M4, Hyeon Burst, Patriot XMR, and Kastov 762 and 14 more. CODMunity lists a stat change on 18 of them; the largest is sprint to fire speed +14% on the ISO Nightshade (worse). It is in 30 popular builds that CODMunity lists.
Community-reportedDMZ Codex, DMZ Radar, wzranked, ggranked, and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the FSS Fireline Grip
Activision publishes no compatibility list; 5 community sources report these 19 weapons. No weapon level is reported.
| Weapon | Class | Weapon level | Stats with a listed change |
|---|---|---|---|
| Han 86 | Assault Rifle | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (moderate, worse), sprint to fire speed (small, worse), and ADS out speed (small, worse) | |
| M4 | Assault Rifle | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (moderate, worse), sprint to fire speed (small, worse), and ADS out speed (small, worse) | |
| Hyeon Burst | Assault Rifle | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (small, worse), sprint to fire speed (small, worse), and ADS out speed (small, worse) | |
| Patriot XMR | Assault Rifle | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (small, worse), sprint to fire speed (small, worse), and ADS out speed (small, worse) | |
| Kastov 762 | Assault Rifle | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (small, worse), sprint to fire speed (small, worse), and ADS out speed (small, worse) | |
| Oden | Assault Rifle | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), sprint to fire speed (small, worse), ADS speed (small, worse), and ADS out speed (small, worse) | |
| Axion | Assault Rifle | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (moderate, worse), sprint to fire speed (small, worse), and ADS out speed (small, worse) | |
| Cronen Squall | Assault Rifle | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (small, worse), sprint to fire speed (small, worse), and ADS out speed (small, worse) | |
| ISO Nightshade | SMG | sprint to fire speed (moderate, worse), vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (moderate, worse), and ADS out speed (small, worse) | |
| VEL 46 | SMG | sprint to fire speed (moderate, worse), ADS speed (moderate, worse), vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), and ADS out speed (moderate, worse) | |
| Wz.55 Striga | SMG | No change listed | |
| PPSh-41 | SMG | sprint to fire speed (moderate, worse), vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (small, worse), and ADS out speed (small, worse) | |
| X-58 Nyx | SMG | sprint to fire speed (moderate, worse), vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (moderate, worse), and ADS out speed (moderate, worse) | |
| Rezi 12 | Shotgun | sprint to fire speed (moderate, worse), vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (small, worse), and ADS out speed (small, worse) | |
| Warlord | Shotgun | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), sprint to fire speed (small, worse), ADS speed (small, worse), and ADS out speed (small, worse) | |
| MAR-9 | Marksman Rifle | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (small, worse), sprint to fire speed (small, worse), and ADS out speed (small, worse) | |
| Oris 8.6 | Marksman Rifle | sprint to fire speed (moderate, worse), vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (moderate, worse), and ADS out speed (small, worse) | |
| Mosin-Nagant | Marksman Rifle | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), ADS speed (small, worse), ADS out speed (small, worse), and sprint to fire speed (small, worse) | |
| Signal 50 | Sniper Rifle | vertical recoil (moderate, better), horizontal recoil (moderate, better), vertical gun kick (moderate, better), horizontal gun kick (moderate, better), sprint to fire speed (small, worse), ADS out speed (small, worse), and ADS speed (small, worse) |
What the FSS Fireline Grip changes
Percent changes are relative to the base value with nothing attached (CODMunity, read November 4, 2026).
| Weapon | Stat | Base | With it | Change |
|---|---|---|---|---|
| Han 86 | Vertical recoil | 41.9 | 38.1 | −9% (better) |
| Horizontal recoil | 11.2 | 10.2 | −9% (better) | |
| ADS speed | 250 ms | 270 ms | +8% (worse) | |
| Sprint to fire speed | 210 ms | 225 ms | +7% (worse) | |
| M4 | Vertical recoil | 40.6 | 36.9 | −9% (better) |
| Horizontal recoil | 17.1 | 15.6 | −9% (better) | |
| ADS speed | 240 ms | 259 ms | +8% (worse) | |
| Sprint to fire speed | 210 ms | 225 ms | +7% (worse) | |
| Hyeon Burst | Vertical recoil | 38.3 | 34.9 | −9% (better) |
| Horizontal recoil | 16.4 | 14.9 | −9% (better) | |
| ADS speed | 275 ms | 294 ms | +7% (worse) | |
| Sprint to fire speed | 210 ms | 225 ms | +7% (worse) | |
| Patriot XMR | Vertical recoil | 52.6 | 47.9 | −9% (better) |
| Horizontal recoil | 14.4 | 13.1 | −9% (better) | |
| ADS speed | 280 ms | 300 ms | +7% (worse) | |
| Sprint to fire speed | 210 ms | 225 ms | +7% (worse) | |
| Kastov 762 | Vertical recoil | 51.9 | 47.2 | −9% (better) |
| Horizontal recoil | 28.7 | 26.1 | −9% (better) | |
| ADS speed | 280 ms | 300 ms | +7% (worse) | |
| Sprint to fire speed | 210 ms | 225 ms | +7% (worse) | |
| Oden | Vertical recoil | 49.4 | 45.0 | −9% (better) |
| Horizontal recoil | 15.2 | 13.8 | −9% (better) | |
| Sprint to fire speed | 210 ms | 225 ms | +7% (worse) | |
| ADS speed | 320 ms | 339 ms | +6% (worse) | |
| Axion | Vertical recoil | 48.9 | 44.5 | −9% (better) |
| Horizontal recoil | 13.7 | 12.5 | −9% (better) | |
| ADS speed | 260 ms | 281 ms | +8% (worse) | |
| Sprint to fire speed | 210 ms | 225 ms | +7% (worse) | |
| Cronen Squall | Vertical recoil | 50.4 | 45.9 | −9% (better) |
| Horizontal recoil | 6.3 | 5.7 | −9% (better) | |
| ADS speed | 305 ms | 326 ms | +7% (worse) | |
| Sprint to fire speed | 210 ms | 225 ms | +7% (worse) | |
| ISO Nightshade | Sprint to fire speed | 110 ms | 125 ms | +14% (worse) |
| Vertical recoil | 40.9 | 37.2 | −9% (better) | |
| Horizontal recoil | 13.3 | 12.1 | −9% (better) | |
| ADS speed | 240 ms | 259 ms | +8% (worse) | |
| VEL 46 | Sprint to fire speed | 110 ms | 125 ms | +14% (worse) |
| ADS speed | 230 ms | 251 ms | +9% (worse) | |
| Vertical recoil | 39.6 | 36.0 | −9% (better) | |
| Horizontal recoil | 12.5 | 11.4 | −9% (better) | |
| PPSh-41 | Sprint to fire speed | 110 ms | 125 ms | +14% (worse) |
| Vertical recoil | 38.6 | 35.1 | −9% (better) | |
| Horizontal recoil | 16.9 | 15.4 | −9% (better) | |
| ADS speed | 280 ms | 300 ms | +7% (worse) | |
| X-58 Nyx | Sprint to fire speed | 110 ms | 125 ms | +14% (worse) |
| Vertical recoil | 36.0 | 32.8 | −9% (better) | |
| Horizontal recoil | 10.5 | 9.6 | −9% (better) | |
| ADS speed | 255 ms | 275 ms | +8% (worse) | |
| Rezi 12 | Sprint to fire speed | 160 ms | 174 ms | +9% (worse) |
| Vertical recoil | 98.5 | 89.6 | −9% (better) | |
| Horizontal recoil | 17.4 | 15.8 | −9% (better) | |
| ADS speed | 340 ms | 360 ms | +6% (worse) | |
| Warlord | Vertical recoil | 79.9 | 72.7 | −9% (better) |
| Horizontal recoil | 29.1 | 26.5 | −9% (better) | |
| Sprint to fire speed | 210 ms | 225 ms | +7% (worse) | |
| ADS speed | 340 ms | 360 ms | +6% (worse) | |
| MAR-9 | Vertical recoil | 62.0 | 56.4 | −9% (better) |
| Horizontal recoil | 14.9 | 13.6 | −9% (better) | |
| ADS speed | 330 ms | 350 ms | +6% (worse) | |
| Sprint to fire speed | 249 ms | 264 ms | +6% (worse) | |
| Oris 8.6 | Sprint to fire speed | 150 ms | 165 ms | +10% (worse) |
| Vertical recoil | 52.0 | 47.3 | −9% (better) | |
| Horizontal recoil | 30.0 | 27.3 | −9% (better) | |
| ADS speed | 260 ms | 281 ms | +8% (worse) | |
| Mosin-Nagant | Vertical recoil | 78.8 | 71.7 | −9% (better) |
| Horizontal recoil | 45.5 | 41.4 | −9% (better) | |
| ADS speed | 350 ms | 371 ms | +6% (worse) | |
| Sprint to fire speed | 240 ms | 254 ms | +6% (worse) | |
| Signal 50 | Vertical recoil | 19.8 | 18.0 | −9% (better) |
| Horizontal recoil | 8.4 | 7.6 | −9% (better) | |
| Sprint to fire speed | 283 ms | 297 ms | +5% (worse) | |
| ADS speed | 590 ms | 608 ms | +3% (worse) |
CODMunity lists no stat change for the Wz.55 Striga.
Smaller changes are left out of the table: 3 other stats on the Han 86, 3 other stats on the M4, 3 other stats on the Hyeon Burst, 3 other stats on the Patriot XMR, 3 other stats on the Kastov 762, 3 other stats on the Oden, 3 other stats on the Axion, 3 other stats on the Cronen Squall, 3 other stats on the ISO Nightshade, 3 other stats on the VEL 46, 3 other stats on the PPSh-41, 3 other stats on the X-58 Nyx, 3 other stats on the Rezi 12, 3 other stats on the Warlord, 3 other stats on the MAR-9, 3 other stats on the Oris 8.6, 3 other stats on the Mosin-Nagant, and 3 other stats on the Signal 50.
Changes across weapons
The stats it changes on 18 weapons, with the lowest and highest change.
| Stat | Weapons | Lowest change | Highest change | Verdicts |
|---|---|---|---|---|
| Sprint to fire speed | 18 | +5% | +14% | 0 better, 18 worse |
| ADS speed | 18 | +3% | +9% | 0 better, 18 worse |
| Horizontal recoil | 18 | −9% | −9% | 18 better, 0 worse |
| Vertical recoil | 18 | −9% | −9% | 18 better, 0 worse |
| Horizontal gun kick | 18 | −9% | −9% | 18 better, 0 worse |
| Vertical gun kick | 18 | −9% | −9% | 18 better, 0 worse |
| ADS out speed | 18 | +4% | +8% | 0 better, 18 worse |
How it ranks among underbarrel attachments
Its largest change on each weapon, compared with the other underbarrel attachments the source lists that stat for.
- Han 86: its moderate vertical recoil change (better) is the only one listed.
- M4: its moderate vertical recoil change (better) is the best of 2 underbarrel attachments.
- Hyeon Burst: its moderate vertical recoil change (better) is the only one listed.
- Patriot XMR: its moderate vertical recoil change (better) is the only one listed.
- Kastov 762: its moderate vertical recoil change (better) is the only one listed.
- Oden: its moderate vertical recoil change (better) is the only one listed.
- Axion: its moderate vertical recoil change (better) is the only one listed.
- Cronen Squall: its moderate vertical recoil change (better) is the only one listed.
Pros and cons the sources list
Text from the community sources, without numbers.
Pros
- Pro: Firing stability
Cons
- Con: Aiming speed
Popular builds that use the FSS Fireline Grip
CODMunity lists 30 popular builds that use it: 15 for Multiplayer and 15 for DMZ. The styles are Versatile, Mobility, Apex Attachment, Close Range, and Long Range. The same builds also use muzzle, barrel, stock, laser, rear grip, magazine, optic, bolt, comb, and ammunition attachments.
| Weapon | Mode and style | Tier | Other attachments | Builder |
|---|---|---|---|---|
| VEL 46 | Multiplayer, Versatile | Absolute meta | Muzzle: XRK Herder 40, Barrel: VB-46 Series 11, Stock: EXP U-Turn Stock, and Laser: XRK Clutch-LS | Open in the builder: VEL 46, Versatile |
| VEL 46 | Multiplayer, Versatile with Apex Attachment | Absolute meta | Muzzle: XRK Herder 40, Barrel: VB-46 Series 11, Rear Grip: V46 R-Skel Grip, and Laser: XRK Clutch-LS | Open in the builder: VEL 46, Versatile |
| VEL 46 | Multiplayer, Mobility with Apex Attachment | Meta | Muzzle: DEMO Ironshade, Barrel: VB-46 Series 11, Magazine: 60 Round Drum, and Laser: Schlager VISIV-5 | Open in the builder: VEL 46, Mobility |
| Hyeon Burst | Multiplayer, Versatile with Apex Attachment | Absolute meta | Muzzle: FSS IS300, Barrel: Mugi Ingoem 559mm, Stock: HVY-80 Stockpad, and Laser: SA LAZ-500 | Open in the builder: Hyeon Burst, Versatile |
| Hyeon Burst | Multiplayer, Mobility with Apex Attachment | Very good | Muzzle: FSS IS40, Magazine: 40 Round Mag, Stock: Mugi BAL-202 Stock, and Laser: SZ Gen.6 PEQ | Open in the builder: Hyeon Burst, Mobility |
| ISO Nightshade | Multiplayer, Versatile with Apex Attachment | Absolute meta | Muzzle: XRK Herder 40, Magazine: 40 Round Mag, Rear Grip: Demo STP-1, and Stock: EXP G2-44 Stock | Open in the builder: ISO Nightshade, Versatile |
| ISO Nightshade | Multiplayer, Mobility | Contender | Muzzle: XRK Herder 40, Magazine: 50 Round Drum Mag, Stock: No Stock, and Laser: Schlager VISIV-5 | Open in the builder: ISO Nightshade, Mobility |
| Kastov 762 | Multiplayer, Versatile with Apex Attachment | Contender | Muzzle: Ivanov QR600, Rear Grip: Hanbit TechGrip, Stock: Hanbit 655L-M Stock, and Laser: XRK Clutch-LS | Open in the builder: Kastov 762, Versatile |
| Patriot XMR | Multiplayer, Versatile with Apex Attachment | Very good | Optic: ZLR Type C, Muzzle: Meiko 30CAL-SP, Magazine: 35 Round Mag, and Laser: SA LAZ-500 | Open in the builder: Patriot XMR, Versatile |
| X-58 Nyx | Multiplayer, Mobility with Apex Attachment | Very good | Magazine: 60 Round Mag, Rear Grip: Bok-980, Stock: No Stock, and Laser: Schlager VISIV-5 | Open in the builder: X-58 Nyx, Mobility |
| X-58 Nyx | Multiplayer, Versatile | Very good | Barrel: Doksa 4F 305mm, Rear Grip: Mugi 050-T Grip, Stock: No Stock, and Laser: XRK Clutch-LS | Open in the builder: X-58 Nyx, Versatile |
| PPSh-41 | Multiplayer, Versatile | Meta | Optic: ZLR Type C, Barrel: Hanbit Chimmuk-INTR, Stock: Hanbit Janggun-H9, and Laser: Schlager VISIV-5 | Open in the builder: PPSh-41, Versatile |
| PPSh-41 | Multiplayer, Mobility | Very good | Muzzle: Haebang BAM70, Barrel: TT Banseok-24N, Stock: MT-L5 Jinhwa, and Laser: Schlager VISIV-5 | Open in the builder: PPSh-41, Mobility |
| Oden | Multiplayer, Versatile | Meta | Optic: ZLR Type C, Muzzle: VLK SH-S12, Magazine: 30 Round Mag, and Laser: XRK Clutch-LS | Open in the builder: Oden, Versatile |
| Axion | Multiplayer, Versatile | Absolute meta | Optic: ZLR Type C, Muzzle: FSS IS40, Stock: Cronen Blackstone-6P, and Laser: XRK Clutch-LS | Open in the builder: Axion, Versatile |
| Han 86 | DMZ, Apex Attachment with Apex Attachment | Not tiered | Muzzle: FSS IS300, Magazine: 60 Round Drum, Rear Grip: FTAC Griplord 80, and Laser: Schlager VISIV-5 | Open in the builder: Han 86, Apex Attachment |
| VEL 46 | DMZ, Close Range with Apex Attachment | Not tiered | Muzzle: FSS Crackdown, Barrel: VB-46 Series 11, Magazine: 60 Round Drum, and Laser: Schlager VISIV-5 | Open in the builder: VEL 46, Close Range |
| M4 | DMZ, Long Range | Not tiered | Optic: KV Corsac Holo, Muzzle: FSS IS300, Barrel: 18" LE Crosswind, and Magazine: 60 Round Drum | Open in the builder: M4, Long Range |
| Hyeon Burst | DMZ, Long Range with Apex Attachment | Not tiered | Optic: KV Corsac Holo, Muzzle: FSS IS300, Barrel: Mugi Seungri-0P 609mm, and Magazine: 60 Round Drum Mag | Open in the builder: Hyeon Burst, Long Range |
| Kastov 762 | DMZ, Apex Attachment with Apex Attachment | Not tiered | Muzzle: Gauge-12 Mono, Magazine: 75 Round Drum Mag 7.62, Rear Grip: Hanbit TechGrip, and Stock: Spetsnaz S10 Stock | Open in the builder: Kastov 762, Apex Attachment |
| Kastov 762 | DMZ, Long Range | Not tiered | Optic: KV Corsac Holo, Muzzle: Gauge-12 Mono, Barrel: BCS-K 589mm Barrel, and Magazine: 75 Round Drum Mag 7.62 | Open in the builder: Kastov 762, Long Range |
| Patriot XMR | DMZ, Long Range | Not tiered | Optic: KV Corsac Holo, Muzzle: EXP Undertow Gen. 2, Barrel: EXP Raid Tac 18.5", and Magazine: 50 Round Drum Mag | Open in the builder: Patriot XMR, Long Range |
| Patriot XMR | DMZ, Apex Attachment with Apex Attachment | Not tiered | Optic: KV Corsac Holo, Muzzle: EXP Undertow Gen. 2, Magazine: 50 Round Drum Mag, and Rear Grip: Schlager ATTACK-7 Grip | Open in the builder: Patriot XMR, Apex Attachment |
| X-58 Nyx | DMZ, Close Range | Not tiered | Barrel: LX3-V 409mm, Magazine: 60 Round Mag, Stock: No Stock, and Laser: Schlager VISIV-5 | Open in the builder: X-58 Nyx, Close Range |
| X-58 Nyx | DMZ, Apex Attachment with Apex Attachment | Not tiered | Optic: ZLR Type C, Magazine: 60 Round Mag, Stock: No Stock, and Laser: Schlager VISIV-5 | Open in the builder: X-58 Nyx, Apex Attachment |
| PPSh-41 | DMZ, Close Range | Not tiered | Muzzle: FTAC Silent Recon, Barrel: Hanbit RDR-Tiger 50, Stock: MT-L5 Jinhwa, and Laser: Schlager VISIV-5 | Open in the builder: PPSh-41, Close Range |
| Rezi 12 | DMZ, Close Range | Not tiered | Bolt: XRK Quad-80, Muzzle: EXP Firelite 12, Barrel: Haebang 635R-7, and Stock: No Stock | Open in the builder: Rezi 12, Close Range |
| Oden | DMZ, Apex Attachment with Apex Attachment | Not tiered | Comb: NXK-9F Comb, Stock: Haebang Stal-W5, Laser: Schlager VISIV-5, and Ammunition: 12.7x55mm High Velocity | Open in the builder: Oden, Apex Attachment |
| Oden | DMZ, Long Range | Not tiered | Optic: KV Corsac Holo, Muzzle: TV Multical-77, Barrel: Rockfall-900 Barrel, and Magazine: 30 Round Mag | Open in the builder: Oden, Long Range |
| Axion | DMZ, Long Range | Not tiered | Optic: KV Corsac Holo, Muzzle: FSS IS300, Barrel: SA DMN-L 30", and Magazine: 100 Round Drum | Open in the builder: Axion, Long Range |
Builds are community-reported and unverified.
- All VEL 46 builds, Best VEL 46 build
- All Hyeon Burst builds, Best Hyeon Burst build
- All ISO Nightshade builds, Best ISO Nightshade build
- All Kastov 762 builds, Best Kastov 762 build
- All Patriot XMR builds, Best Patriot XMR build
- All X-58 Nyx builds, Best X-58 Nyx build
- All PPSh-41 builds, Best PPSh-41 build
- All Oden builds, Best Oden build
- All Axion builds, Best Axion build
- All Han 86 builds, Best Han 86 build
- All M4 builds, Best M4 build
- All Rezi 12 builds, Best Rezi 12 build
Frequently asked questions
What does the FSS Fireline Grip do in MW4?
CODMunity lists 126 stat changes for it across 18 weapons: 72 better and 54 worse. The largest is sprint to fire speed +14% on the ISO Nightshade (worse).
Which weapons can use the FSS Fireline Grip?
Community sites list 19 weapons, among them Han 86, M4, Hyeon Burst, Patriot XMR, Kastov 762, Oden, Axion, and Cronen Squall. Activision has not published a compatibility list.
Is the FSS Fireline Grip in a popular build?
Yes. CODMunity lists it in 30 popular builds, on VEL 46, Hyeon Burst, ISO Nightshade, Kastov 762, Patriot XMR, X-58 Nyx, PPSh-41, Oden, Axion, Han 86, M4, and Rezi 12.