The FX Spring 0.75x5x194 is a genuine FX Airguns factory coil spring, with the three-figure designation giving its precise dimensions: 0.75mm wire diameter, approximately 5mm coil diameter, and approximately 194mm free length. This is a slender, fine-wire spring of the type used internally in FX PCP air rifles — commonly employed in transfer port, probe return, or ancillary internal mechanisms where a light, precise spring force is required. The exact dimensions make this a specific service replacement rather than a universal part; fitting the correct spring ensures the mechanism operates within its design parameters. If the original spring has taken a permanent set, broken, or been lost during strip-down, this genuine FX part returns the assembly to factory specification. Check your rifle's parts diagram to confirm this is the correct spring for your model before ordering.
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