The TAPP Green Gas Drum is a 400-round green gas drum (AW Custom) for your KWA USP Compact that bolts on with no HPA setup.
Spec card
| Type | Green Gas Drum |
|---|---|
| Feeds from | Green gas (GBB) drum |
| BB capacity | 400 |
| Overall profile | Large |
| Recommended mags | AW Custom |
| Best for | Plug and play, no HPA setup needed |
Color options
- Black: 400-round AW Custom green gas drum in black
- Red: 400-round AW Custom green gas drum in red
- Green: 400-round AW Custom green gas drum in green
- Green/Black: 400-round AW Custom green gas drum in green/black
- AW Adapter Only: adapter only, for an AW green gas drum you already own
Compatibility
| Brand / Platform | Compatibility Verification | Tuning & Adjustment Notes |
|---|---|---|
| KWA / KSC USP Compact GBB Pistol Series | Direct Native Fit | Direct OEM factory standard for KWA / KSC USP Compact (USPC) series utilizing the System7 / NS2 engine. Fine-tune the adjustable gasket height to establish an airtight compression seal against the loading nozzle seal, ensuring maximum gas efficiency and rapid recoil recovery without creating drag on the returning compact slide assembly. |
| Tokyo Marui / Umarex VFC / WE-Tech USP & Full-Size KWA Lines | NOT Compatible | Third-party USP platforms (Tokyo Marui, VFC, WE-Tech) and full-size KWA models utilize distinct magwell channel dimensions, magazine retention catch heights, and non-matching gas router seal profiles incompatible with KWA USP Compact NS2 architecture. |
Note: this is a one-way fit — the full-size KWA/KSC HK45 & USP HPA Adapter/Drum also works in the USP Compact, but this Compact-specific adapter will not fit the full-size USP, USP Match, or HK45.
What's in the box and how to install
- Plug and play: no pulling valves or feed lips from stock mags.
- Materials: standard body is Nylon PA12. Carbon Fiber is available (3x stiffness, up to 38% higher tensile strength than Nylon 12).
- Made in the USA by TAPP Airsoft.
- Install: insert with the bolt or slide locked back.
- Warranty: 30-Day Warranty + Lifetime Support.
More options
Also available for: KWA/KSC HK45 & USP
Want to compare every option? Use the KWA USP Compact Adapter Builder.
