FR4 Retractable Stock attachment in MW4
The FR4 Retractable Stock is a stock attachment (“Tactical Stock”) that community sites list for 2 weapons: Han 86 and M4. CODMunity lists a stat change on 2 of them; the largest is ADS speed −8% on the Han 86 (better). It is in 1 popular build that CODMunity lists.
Community-reportedggranked and CODMunity, read . Unverified, not Activision data.
Weapons that can equip the FR4 Retractable Stock
Activision publishes no compatibility list; 2 community sources report these 2 weapons. No weapon level is reported.
| Weapon | Class | Weapon level | Stats with a listed change |
|---|---|---|---|
| Han 86 | Assault Rifle | ADS speed (moderate, better) and ADS out speed (moderate, better) | |
| M4 | Assault Rifle | ADS speed (moderate, better) and ADS out speed (moderate, better) |
What the FR4 Retractable Stock 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 | ADS speed | 250 ms | 230 ms | −8% (better) |
| M4 | ADS speed | 240 ms | 221 ms | −8% (better) |
Smaller changes are left out of the table: 1 other stat on the Han 86 and 1 other stat on the M4.
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 | −8% | −8% | 2 better, 0 worse |
| ADS out speed | 2 | −8% | −8% | 2 better, 0 worse |
How it ranks among stock attachments
Its largest change on each weapon, compared with the other stock attachments the source lists that stat for.
- Han 86: its moderate ADS speed change (better) is the best of 2 stock attachments.
- M4: its moderate ADS speed change (better) is in the upper half of 6 stock attachments.
Pros and cons the sources list
None reported, which is different from having none.
Popular builds that use the FR4 Retractable Stock
CODMunity lists 1 popular build that use it, all for DMZ. The styles are Long Range. The same builds also use optic, muzzle, barrel, and magazine attachments.
| Weapon | Mode and style | Tier | Other attachments | Builder |
|---|---|---|---|---|
| Han 86 | DMZ, Long Range | Not tiered | Optic: KV Corsac Holo, Muzzle: FSS IS300, Barrel: SA H86 465mm, and Magazine: 60 Round Drum | Open in the builder: Han 86, Long Range |
Builds are community-reported and unverified.
Frequently asked questions
What does the FR4 Retractable Stock do in MW4?
CODMunity lists 4 stat changes for it across 2 weapons: 4 better and 0 worse. The largest is ADS speed −8% on the Han 86 (better).
Which weapons can use the FR4 Retractable Stock?
Community sites list Han 86 and M4. Activision has not published a compatibility list.
Is the FR4 Retractable Stock in a popular build?
Yes. CODMunity lists it in 1 popular build, on Han 86.