The TAPP Green Gas Drum is a 400-round green gas drum (AW Custom) for your Umarex / VFC H&K UMP45 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 |
|---|---|---|
| Umarex / VFC H&K UMP45 GBB Series | Direct Native Fit | Direct OEM factory standard for the VFC-manufactured UMP45 gas platform. Fine-tune gasket height to achieve a tight compression seal against the loading nozzle seal, ensuring maximum gas efficiency without binding the bolt during cycling. |
| Umarex / VFC H&K UMP9 GBB Series | Verified Fit (Shared Internal Gas Architecture) | Shares the VFC UMP blowback engine, upper receiver housing, and valve knocker alignment. Fine-tune gasket height to ensure full seal contact against the nozzle rubber and prevent air loss during rapid fire. |
| VFC MP5 / G3 / HK53 / KWA SMG GBBR Series | NOT Compatible | Third-party and non-UMP SMG platforms utilize distinct magazine catch heights, locking lug channels, and non-matching gas router seal contours that will not seat or seal in the UMP magwell housing. |
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
Want to compare every option? Use the Umarex / VFC H&K UMP45 Adapter Builder.
