Umarex Zelos Hammer Weight Hammer Weight:Brass 7gram Once there is pressure inside

Once there is pressure inside the action the valve will remain closed

They will not work without it

x1 Brass barrel adapter (

With this modification you can expect a higher shot count/fps

FX Maverick

Umarex Zelos Hammer Weight Hammer Weight:Brass 7gram Once there is pressure insideCustom hammer weight machined for the Zelos. The brass tungsten hammer weight is needed to open the valve when using higher reg pressure or wanting longer valve dwell time. Increase in fps will vary depending on the setup. Ive seen up to 15fps with the brass and up to 30fps increase with the tungsten on my personal setup. Other mods like porting and larger valve will assist as well You will use your existing factory hammer spring and replace the