Is it venting gas when it stops half cycle?
Did you try with a no gas in mag ,no slide on to see how the valve striker connects with the release valve on the mag.
SOmetimes when you tighten the grip to the frame you can put a slight forward or backward tilt as to how the mag meets the striker through the grip magwell alignment
SOmetimes you can overtighten the grip screws as well as the piston housing screw to the
slide and cause finicky issues
Did you upgrade the mag feed lips or gas route buckings ? Those can cause certain issues as well
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