P01 grit and possible solutions

[briang2ad]

New non-omega.  New:  plenty of nasty grit and stacking.  Back to CZ, and some of the stacking was relieved. 

Got the CGW defensive kit.  Broker her apart.  My fear of the decocker sear cage is almost gone - really not crazy bad. 

While I had it apart I was really surprised - the TB was the best Ive seen on a 75.  No tool marks.  So I took it easy and used tiny felt pads and the dremel to carefully polish - look superb.  Did all the usual polishing and even gently stoned the disco which looks OK but some mold garbage up on top of the disco needed smoothing. 

Put it all back together, and thought all would be smooth.  Not really - all the grittiness became bumpiness.  Not a smooth DA trigger.  The weaker mainspring makes it more useable, but wow. 

What am I missing?  Will adding the CGW disco or polishing the disco more help?

Thanks. 

[Earl Keese]

Pretty sure the absence of tool marks on the trigger bar is because they're made of MIM now.

[briang2ad]

This one IS different. It looked pretty amazing.  Normally CZ 75 TBs make an AK trunion look like polished silver.  Just cannot understand where the grit is coming from. 

[Earl Keese]

Starting with the hammer, I remove parts and work the trigger until I don't feel grittiness. If the grit is gone, the previously removed part is the culprit.

[M1A4ME]

Check out the hammer spring "guide".  I've seen those with chatter marks on the corners that the spring coils rub against.  I've got one or two pistols that I could hear the sort of clinking/popping sounds as the coils bounced/slipped from on groove/chatter mark to the next as you cocked the hammer - if I held the pistol up close to my ear.  Took the hammer/guide out, smoothed the corners on a stone and got rid of that source of drag and roughness.

[Claymore504]

As others have said check the hammer strut. I usually smooth the edges and polish. I also polish the ends of the hammer spring.

[SEAKPhotog]

I've got the same issue with my PCR.  The DA is gritty even after both CGW and I polished the internals.  I can't see an obvious reason for it either.  All my other CZs I've polished are very smooth.  I keep meaning to tear it down yet again and give it another go.  Maybe I'll do that sooner rather than later and report back.  Good Luck!

[M1A4ME]

Near the top of the part that spring actually slides/ride against you can better see the little shiny spots on that one corner.  As the spring compresses the coils pop into the grooves, then up, out, over the hump and down into the next groove (shiny spot.  You can feel them with your finger/fingernail.  Polish those corners smooth and it'll help with some of the gritty feeling.

[briang2ad]

I always do a thorough job on the hammer spring guide.  I even pay special attention to the top where the spring ends and polish the spring ends also.  I put in plenty of grease.  All the time I've done this, I have NEVER found it to make a difference in the gritty feel.  I have even had guns with plenty of chatter marks there and after smoothing it made no difference. 

I may just get new CGW disco and see.  But the grit makes NO sense. 

[briang2ad]

I've got the same issue with my PCR.  The DA is gritty even after both CGW and I polished the internals.  I can't see an obvious reason for it either.  All my other CZs I've polished are very smooth.  I keep meaning to tear it down yet again and give it another go.  Maybe I'll do that sooner rather than later and report back.  Good Luck!

Here is what CGW told me and it makes sense.  The angle on the bottom of the sear cage is TOO STEEP which dos all kinds of bad things to the SA pull and increases grit.  Because of polishing, mine is really "bumpy" now, but still there. This requires some steel shaping with a cutting stone.  If I get some time, I'll likely do it at some point. 

[viking499]

Does a CGW sear cage solve the angle issue?

[Earl Keese]

I've got the same issue with my PCR.  The DA is gritty even after both CGW and I polished the internals.  I can't see an obvious reason for it either.  All my other CZs I've polished are very smooth.  I keep meaning to tear it down yet again and give it another go.  Maybe I'll do that sooner rather than later and report back.  Good Luck!

I'm surprised that CGW let it go with a gritty DA pull. I heard Scott left, is David still involved?

[SEAKPhotog]

I've got the same issue with my PCR.  The DA is gritty even after both CGW and I polished the internals.  I can't see an obvious reason for it either.  All my other CZs I've polished are very smooth.  I keep meaning to tear it down yet again and give it another go.  Maybe I'll do that sooner rather than later and report back.  Good Luck!

Here is what CGW told me and it makes sense.  The angle on the bottom of the sear cage is TOO STEEP which dos all kinds of bad things to the SA pull and increases grit.  Because of polishing, mine is really "bumpy" now, but still there. This requires some steel shaping with a cutting stone.  If I get some time, I'll likely do it at some point.

Hmmm, interesting but my SA is terrific, it's the DA that's gritty.

[SEAKPhotog]

I've got the same issue with my PCR.  The DA is gritty even after both CGW and I polished the internals.  I can't see an obvious reason for it either.  All my other CZs I've polished are very smooth.  I keep meaning to tear it down yet again and give it another go.  Maybe I'll do that sooner rather than later and report back.  Good Luck!

I'm surprised that CGW let it go with a gritty DA pull. I heard Scott left, is David still involved?

Yep, David's still there.  It is better than it was prior to its visit to CGW but even after i polished it a 2nd time it's still night and day compared to my other CZs.

[briang2ad]

Does a CGW sear cage solve the angle issue?

This was not suggested by CGW, so I will assume that their sear cage is factory as listed and has no preset modification.  I will say that they told me the TB is so good looking because it is precision MIM.  It does look like a different animal than the standard I've seen over the years.  I actually took a new TB and installed it in an old PreB because the PreB was so bad with stacking. 

I do NOT think I will need to take much off the bottom angle, and I just need to find a SHARP/AGGRESSIVE stone that is wide enough to do both sides at once and decrease the angle.  This is definitely CZ Smith 500, but if you mess up its a $60 for a new sear cage, and you MAY get one that works anyway. 

I just hate all the little springs in the cage.  What a mess.  I even had trouble positioning the decocker spring last time.