In this pic their is alot going on to be seen and inspected
The test to see where the grit is.
Sqeeze trigger back and forth.
No grit.
Firing pin safety plunger is your issue.
Push it up and down
Gritty inconsistent resitance...
Obnoxious schitt.
But manufacturers taking care of it by hand would add alot of cost
Lower
Trigger bar has good cleareance between it and the frame.
No polishing needed no trigger dissembly needed.
Glocks are infamous for tight fit in this area and careful polishing of the trigger bar needs to be done ( no fine sanding) you dont wanta penetrate the tennifer finish on later model glock trigger bars or their shark fin.
Not installing any spring kit.
Not needed for this job to improve this trigger feel or its pd weight.
Lower will be taped up for further work with fine sand paper and polishing only of the sharks fin which depresses the firing pin safety plunger to allow the pistol to be fired and trigger reset.
Contact and drag surfaces is what you are adressing.
Safety plunger
Designs are different
This one is round and flat.
Others are sloped up and down like on gen 5 glocks.
Their are visible maching rings on this plunger and drag marks from the sharks fin across it from me dry firing it since Thursday.
Inside the plunger recess I'm sure their are burrs from the milling which will be addressed also.
Also the tiny little last cut tit in the middle from where it fell off the bar stock in the latheing of it.
Next step will be taping of lower and removal of rear sight to take out plunger.
Other brands if pistols dont require this.
Just take off back plate of slide, remove striker assem and rod keeping safety plunger and extractor in.
Also in this pic you can see really uneven surface imperfections in the firing pin contact area with the sear.
Most def needs to be addressed and maintain factory geometry.
Actual sear in lower looks primo and 0 needs to be done to that .
Thing is shining like a star in the pic.
Will be a overall easy job.
0 trigger mechanism dissembly required on this pistol.
👍👍👍