The TAPP Green Gas Drum is a 400-round green gas drum (AW Custom) for your WE-Tech Open Bolt M4/M16/416/XM177/MK18/MSK/L85/SCAR-L 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 Open Bolt M4 / M16 / 416 / XM177 / MK18 GBBR Series | Direct Native Fit | Direct OEM factory standard for WE-Tech Open Bolt STANAG AR-15 platforms. Features an adjustable plunger to calibrate engagement against the internal valve knocker pin. Fine-tune gasket height to form a complete air seal against the loading nozzle rubber without creating drag on the returning bolt carrier group. |
| WE-Tech Open Bolt SCAR-L / MSK / L85 / PDW GBBR Series | Verified Fit (Shared STANAG Engine Architecture) | Shares WE Open Bolt STANAG magwell retention profile, trigger box, and nozzle alignment. Fine-tune the plunger set screw depth and gasket height for consistent output and smooth bolt operation across receiver tolerances. |
| WE-Tech AWSS (Closed Bolt) & Third-Party M4 GBBR Lines | NOT Compatible | Legacy WE Closed Bolt (brass cylinder) systems and third-party STANAG GBB platforms (Tokyo Marui MWS, VFC, GHK, KWA) utilize distinct magwell catch dimensions, different valve knocker stroke lengths, and proprietary nozzle seal profiles. |
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: VFC M4, KJW M4, KWA/KSC M4, GHK M4/MK18/G5, WA/WOC/GE/KA/Matrix/Inokatsu, SRC ZAROS SR4, G&G MGCR
Want to compare every option? Use the WE-Tech Open Bolt M4/M16/416/XM177/MK18/MSK/L85/SCAR-L Adapter Builder.
