The FX Valve Adjuster Screw is a genuine FX Airguns factory spare used to set and fine-tune valve behaviour on FX PCP air rifles. On FX platforms with an adjustable valve, this screw controls the pre-load or position of the valve return spring, altering how readily the valve opens and how long it stays open — the two key variables that determine shot power and consistency. Getting the adjuster screw setting right is fundamental to dialling in a stable tune: it works in combination with hammer weight and regulator output pressure to deliver the correct velocity for a given projectile and fill pressure range. If the existing screw is worn, cross-threaded, or missing, replacing it with this factory part ensures the correct thread form and engagement length are restored. Confirm compatibility with your specific FX rifle model before ordering.
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