The TAPP Drum Adapter puts a 400-2,500+ round drum on your WA/WOC/GE/KA/Matrix/Inokatsu for suppressive fire.
Spec card
| Type | Drum |
|---|---|
| Feeds from | Drum magazine (pre-installed) |
| BB capacity | 400-2,500+ |
| Overall profile | Medium to Large |
| Recommended mags | Tokyo Marui or Angel Custom drum |
| Best for | Suppressive fire and general skirmishes |
Drum options
- 400rd Mini: 400-round mini drum
- 1500rd Flash: 1,500-round flash drum
- 1500rd Electric: 1,500-round electric drum
- 1500rd Electric Tan: 1,500-round electric drum in tan
- 2000rd Flash: 2,000-round flash drum
- 2000rd Electric: 2,000-round electric drum
- 1200rd Twin: 1,200-round twin drum
- Adapter Only – Angel Custom: adapter only, for an Angel Custom drum you already own
- Adapter Only – TM Mini: adapter only, for a Tokyo Marui mini drum you already own
- Adapter Only – TM Twin: adapter only, for a Tokyo Marui twin drum you already own
- Adapter Only – A&K: adapter only, for an A&K drum you already own
- Adapter Only – ICS: adapter only, for an ICS drum you already own
Compatibility
| Brand / Platform | Compatibility Verification | Tuning & Adjustment Notes |
|---|---|---|
| Western Arms (WA) M4 | Verified Direct Fit | The foundational standard for this adapter system. Use default gasket and plunger settings out of the box for optimal seal and trigger resets. |
| G&P (WOC Series) | Verified Fit (Tuning Recommended) | G&P receivers have tighter magwell tolerances and tight nozzle alignments. Use the adjustable gasket height to lower or raise the gas router flush against the bolt nozzle to stop gas leaks without causing nozzle dragging or sluggish cycling. |
| Golden Eagle / Matrix / S&T | Verified Fit (Tuning Recommended) | These platforms frequently exhibit receiver-to-receiver manufacturing variance. The adjustable plunger lets you adjust valve striker contact depth if your mag catch holds the adapter slightly low, while raising the gasket height secures a tight seal against loose-fitting factory nozzles. |
| GHK Old (WA-Spec M4 / G5) | Verified Fit (Tuning Recommended) | Shares WA internal geometry, but the old version GHK valve knockers and loading nozzles sit at slightly different tolerances. Tune the adjustable plunger out slightly to ensure full valve depress on pull, and adjust gasket height to maintain air seal consistency under high ROF/HPA pressures. |
| King Arms GBBR M4 | Verified Fit (Minor Adjustment) | Uses standard WA architecture. King Arms mag wells run slightly deep; fine-tune the adjustable plunger to compensate for knocker travel distance, ensuring complete valve actuation. |
| Inokatsu / Viper Tech | Verified Fit (Tuning Required) | Heavy-duty forged receivers with ultra-strict bolt tolerances. High-profile gas routers can cause bolt drag or stuck nozzles on these models. Lower the gasket height slightly to allow smooth bolt travel while maintaining maximum gas transfer. |
| Tokyo Marui MWS / WE / KWA / VFC | NOT Compatible | These systems use entirely different, proprietary receiver dimensions, valve locations, and feed lip angles. This adapter will not lock in or feed. |
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. US-spec Foster fitting included, never exceed 150 PSI, use a secondary low-pressure regulator.
- Warranty: 30-Day Warranty + Lifetime Support.
More options
Also available for: M4 AEG, VFC M4, KJW M4, KWA/KSC M4, GHK M4/MK18/G5, WE-Tech Open Bolt M4/M16/416/XM177/MK18/MSK/L85/SCAR-L, SRC ZAROS SR4, G&G MGCR
Want to compare every option? Use the WA/WOC/GE/KA/Matrix/Inokatsu Adapter Builder.
