Originally Posted by
darsenalmex
I also had two similar malfunctions with the APX. I’m starting to think, overseeing the issues others have had, that the spring is too strong (according to some sites, it is measured at 18lbs but feels heavier).
One fix is to just run them until the spring is weakened enough to be consistent, but I think a new recoil spring, perhaps the A0 version or an aftermarket one, would be the quickest answer to this. On a subreddit, the Galloway Precision recoil spring 15# gets a mention as a lighter spring that can run.