Date: 19/10/2020 23:2
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Air Arms S400 MPR / HFT 500 Low-Power Firing Valve

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Air Arms S400

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1-year limited warranty



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Air Arms S400 MPR / HFT 500 Low-Power Firing Valve

  • Low Power Firing Valve Assembly for S400 MPR and HFT 500 air rifles.
  • For Low-Power Versions Only




Replace your worn out firing valve for your S400 MPR or HFT 500 with this Air Arms firing valve assembly.


In stock

Item Code: AAP-S370 [PY-A-8341]

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Weight0.12 lbs

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  • Paul from USA asked:

    What is a firing valve?

    • Tyler from USA:

      The firing valve is what opens and closes to control how much air is allowed into the transfer port and then down the barrel. It opens when the hammer strikes it. And closes with the help of a return spring to stop the flow of air during the shot cycle. The design and size of the firing valve is going to vary from gun to gun, this is for the Air Arms S4xx/5xx series rifles only.