Sphinx SDP Improved Hammer Spring & Firing Pin Spring

(4 customer reviews)


  • Reduced power firing pin spring and hammer spring drops trigger pull 1-3.5lbs (SA & DA)
  • Fits SDP, Duty, Subcompact, and all Phoenix Fusion pistols
SKU: SDP Spring Categories: , Tag:


ZRTS is now offering upgraded hammer springs for the Sphinx SDP line. These replacement springs will drop the single action pull 1lb and the double action 3-3.5lbs. Great upgrade for any owner! Includes firing pin spring to increase reliability.  FPS may require installation by a gunsmith. Cross pin is directional!!

Additional information

Weight 1 oz

4 reviews for Sphinx SDP Improved Hammer Spring & Firing Pin Spring

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  1. Nathan (verified owner)

    Verified reviewVerified review - view originalExternal link

    Very easy install, though a print out for the firing pin spring would be nice. You can feel the signal action reduction slightly. The real improvement is with the double action. Much lighter and smoother. Absolutely worth the $20 price tag.

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