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 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: https://hillairgun.com/products/hill-blue-valve-cap/

 

 

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

Price: $7.98