The TAPP Green Gas Drum is a 400-round green gas drum (AW Custom) for your WE M1A1 Thompson 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 |
|---|---|---|
| WE-Tech M1A1 Thompson Open Bolt GBBR Series | Direct Native Fit | Direct OEM factory standard for WE's Thompson M1A1 submachine gun architecture. Fine-tune the adjustable gasket height to ensure a firm, compression-sealed interface against the loading nozzle without introducing bolt drag during full-auto cycling. |
| Tokyo Marui / WE-Tech / Northeast WWII GBBR Lines | NOT Compatible | Third-party electric (AEG) and non-WE historic gas platforms utilize distinct magazine channel dimensions, locking catch heights, and gas router seal contours that are entirely incompatible with the WE Thompson magwell. |
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: WE M14
Want to compare every option? Use the WE M1A1 Thompson Adapter Builder.
