I had a suspicion from something I read in
this article by David Merrill that the off-center light strike problem in the G39 was caused by the recoil spring not being able to overcome the striker spring if the slide closed while the trigger was still to the rear. This issue in the Glock 32 and 20 was solved with heavier recoil springs able to close the slide with more force, but that solution is more difficult with the subcompacts.
So I tried coming at it from the other end by installing a lightened striker spring.
For the first time since I got it, the gun ran through a box of fifty rounds without a hitch, even when I pinned the trigger in an attempt to provoke the out-of-battery off-center light strike problem.
I'm cautiously optimistic and plan on running another couple boxes through to check.
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