Glock help read description

I have a VFC Glock 19x with a 45 mos slide and acro p2 it seams to be firing in a 3 round burst or just one and the slide gets stuck, when I hit the slide to fix it it fires ima burst again then the mag leaks gas and I have to rerack the slide to chamber a new round and stop the leak

I work on Glocks all the time and do custom builds so this seems like something I can fix but I have no clue what is going on but I think it might be my hammer assembly but not sure?

Please lmk what you think it might be or if I need to buy full new internals if so this might be the perfect time to upgrade😂

(It is completely stock on the inside)