Hi you need to push the firing mechanism in, you should hear a slight click as the seal resits. As for the ballbearing use vasaline to reseat the bearing into teh hole. NEVER use MD40 I did and all teh ball bearings fell out
I there
I bought one 2 months back and added 3 more mags. Not that happy with it to tell you the truth
Not used it all day yet, first time i used it it was running hot at 38pfps
bought different gas 144a as recomended and it was operating at 33ofps but vented gas repeatedly after 3 mags...