KWA I-1 Ball Bearing
The KWA I-1 ball bearing works with the KWA E-10 hop-up bucking, which fits most KWA gas pistols. The bucking is sold separately.

What the I-1 Ball Bearing fits
| Model | All parts |
|---|---|
| KWA AEG 2.5 and 3 mechbox | AEG mechbox parts |
| Radian Model 1 ETU | Radian Model 1 ETU parts |
| ATP / ATP Auto | — |
| ATP-LE | ATP-LE parts |
| ATP-SE | ATP-SE parts |
| EVE-4 | EVE-4 parts |
| EVE-9 | EVE-9 parts |
| KMP9 | KMP9 parts |
| KMP9R | KMP9R parts |
| kz.75 | kz.75 parts |
| M11A1 NS2 | M11A1 NS2 parts |
| M1911 MK Series and M1911A1 | M1911 MK parts |
| M226 | M226 parts |
| M9 PTP | M9 PTP parts |
| M93R II | M93R II parts |
| QRF Mod 1 | QRF Mod 1 parts |
| QRF Mod 2 | QRF Mod 2 parts |
| QRF Mod 3 | QRF Mod 3 parts |
| RM4 SR10 | RM4 SR10 parts |
| Ronin 47 | Ronin 47 parts |
| TK.45 CQB | TK.45 CQB parts |
| TK.45 Recoil | TK.45 Recoil parts |
| TT-33 | TT-33 parts |
| VM4A1 | — |
Diagram numbers vary by model: 95, 38, 121, 111, 125, 99, 84, 112, 91 or 401. Check your model’s diagram.
What the I-1 Ball Bearing does
What it does
A small steel ball bearing used in many KWA models. In KWA gas pistols it works with the E-10 hop-up bucking.
When to replace it
- It was lost during disassembly. It is small and easy to drop.
- You are replacing the E-10 bucking on a model that uses one
The E-10 hop-up bucking is sold separately.
Often replaced together
Small parts wear together. Order them in one go and save a second wait.
Order the right part the first time
- Open Manuals & diagrams and find your model’s exploded diagram.
- Find the part on the diagram and note its number.
- Check the number against the table above, then add the part to your cart. Order by KWA part code I-1 (SKU 199-9999-I001).
Work on an unloaded gun with the magazine out and no gas in it. If you are not sure about taking your gun apart, ask KWA support before you start.
I-1 Ball Bearing specs
| KWA part code | I-1 |
|---|---|
| SKU | 199-9999-I001 |
I-1 Ball Bearing FAQ
Which KWA models does the I-1 Ball Bearing fit?
The KWA AEG 2.5 and 3 mechbox, Radian Model 1 ETU, ATP / ATP Auto, ATP-LE, ATP-SE, EVE-4, EVE-9, KMP9, KMP9R, kz.75, M11A1 NS2, M1911 MK Series and M1911A1, M226, M9 PTP, M93R II, QRF Mod 1, QRF Mod 2, QRF Mod 3, RM4 SR10, Ronin 47, TK.45 CQB, TK.45 Recoil, TT-33 and VM4A1.
Do I earn KWA Rewards points on parts?
Yes. KWA Rewards members earn 1 point for every $1 on orders of $50 or more, and 50 points = $1 in store credit. Parts, magazines and gas all count toward the order total. See KWA Rewards.




