Product Categories:

 Closing the valve sooner ( along with a proper tune ), can allow for higher efficiency, more shots per fill, and a lower extreme spread in velocities per fill.


* If purchasing for a gen 1 Marauder rifle,  you will also need to add the hillairgun high flow valve cap to your order:



Includes:  1- hill 59 valve spring and free shipping within in the USA

Price: $7.98