For TAR-21/Tavor fans, something to use to stabilise the bullpup rifle from FAB Defense called the TAR Podium though you may need to wait for the airsoft version since we're not sure if this can be made to fit the AEGs without doing some modification... "The TAR Podium is a especially made bipod platform for the TAR 21 rifles.

Advantages:

• Compact and sleek design with no protruding parts.
• Rapid deployment mechanism operates by the push of a button.
• Provides steady and durable bipod platform.
• Quick and easy installation, no Gunsmith required.
• Replaces the grip bottom cap and secured with a single screw
• Made of light and durable high-end reinforced polymer composite.
• Saves valuable rail space for additional mounting options.
• Available in black, olive drab green or desert tan.

Compatibility:

• TAR 21 rifles including CTAR 21 / GTAR 21 and STAR 21."