your symptoms could be caused by so many factors it's funny to fix, you'll see:
1. broken release valve
2. broken release valve seal (oring)
3. swell release valve inner o-ring prevents the nipple to stick out enough
4. didn't charge the mag properly (not full)
5. gas routing rubber worn, broken, split.
6. worn firing pin
7. worn hammer spring
8. slide too tight
9. chamber slide engagment tarded
10. breech loose
11. floating valve damaged
12. floating valve spring damaged
13. breech and hammer catching
14. magcatch worn, mag sits lower (leaking gas when fire)
15. mag's magcatch notch worn
16. firing pin not smooth enough
17. hammer spring housing stub (where the strut sits) worn down
Any or all combinations up there would do it. It's crazy man, when something like this comes up for me I practically spend a week on it.
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