(SOLVED)
Fully stripped my SP-01 frame and reassembled it. DA is now unreliable.
Changed: floating trigger pin, firing pin, hammer spring, recoil spring, a few other pins. Trigger bar and trigger bar spring are both original, just removed and reinstalled.
SA is fine. DA works consistently upside down and right-side-down, fails upright and left-side-down. With grips off I can move the trigger bar up and down by hand — the spring limits travel but doesn't press the bar into engagement. No preload I can feel.
Main question: is there a proper way to reinstall the trigger bar spring? I suspect I got the leg seated wrong, or the floating trigger pin changed where the spring sits. Looking for the correct routing and any trick to getting it seated under tension.
Also:
- How much preload should you feel on the trigger bar with grips off?
- Anyone seen a floating trigger pin affect trigger bar spring tension?
EDIT:
I solved the problem by taking off the grips, loosening the screw, and pushing the spring and the box into the binding position with my finger, so the spring exerts pressure on the trigger bar. Then I tightened the screw to fix the spring’s position. It works for dry-fire.