Try working the trigger a bit as you apply force forward and back. Just reasonable hand force, not 3# hammer force.
I call it tickling the trigger and I sometimes have to do it with my PM45.
You didn't get it apart and put the slide lock back in before all this did you?
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."