The TAPP Green Gas Drum is a 400-round green gas drum (AW Custom) for your TM MWS/89/MK18/ZET 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 |
|---|---|---|
| Tokyo Marui M4A1 MWS / ZET System GBBR Series | Direct Native Fit | Direct OEM factory standard for TM's proprietary ZET System AR-15 blowback architecture. Features an adjustable plunger to calibrate engagement depth against the spring-loaded valve knocker pin. Fine-tune gasket height to maintain an airtight compression fit against the MWS nozzle seal without causing bolt carrier drag. |
| Tokyo Marui Type 89 / MK18 Mod 1 GBBR Series | Verified Fit (Shared ZET Engine Architecture) | Utilizes the same internal TM ZET System valve geometry and receiver magwell dimensions. Adjust plunger set screw depth and gasket elevation to ensure smooth cycling and consistent gas output. |
| VFC / GHK / WE-Tech M4 GBBR Series | NOT Compatible | Third-party M4 GBBR platforms utilize distinct valve knocker angles, striker travel distances, and magazine catch heights that are incompatible with TM MWS specs. |
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: Toxicant XM5, EMG-DE PCC
Want to compare every option? Use the TM MWS/89/MK18/ZET Adapter Builder.
