Concave Bucking


Silicone rubber



Shore A40



AEG or VSR-10 chamber

Only works with Airsoftphilosopher barrels.


FPS recommendation:

200-600 fps (equals 0.4 - 3.3 Joule )

Concave bucking

-10% OFF with the discount code: PREORDER

11,90 €

  • Ships about end of August

Designed for the Maximum


The Concave Bucking is designed to reach the physical limits of accuracy and range. It provides a 6.6 mm long contact patch in order to guide the BB perfectly and apply precise backspin.


Best results are achieved with the Airsoftphilosopher VSR Chamber or the Maxx Model AEG chamber with concave nub.

Note: Most chambers are not designed for big hop windows and bridged barrels. Please make sure the Hopup arm and nub applies pressure at the correct position.

Perfect airseal


Every Hopup bucking has two main tasks:
Applying perfect Hop and providing airseal.


So the Airsoftphilosopher concave bucking feeding lip was designed to provide perfect airseal without causing feeding problems.


The additional 3D impress on the outside improves the airseal inside the chamber.

Special developed material


The durable silicone rubber is designed to create perfect friction between BB and Bucking. The large contact area of the patch allows it to use very soft rubber which creates perfect air seal and is still capable to Hop the heaviest weight BBs.


Special side effect:
You never have to remember to turn off your Hopup after the game, because our material has a very low pressure set and returns into its original shape even after being under pressure for a long time.