installing the CZ75 trigger spring

[xorbe]

I just managed to install the flat czcustom trigger with the trigger spring ... holy #^@%!  Didn't see an installation how-to around here, so this is how I did it.  It's pretty darn challenging.  One thing to note was my stock roll pin was only flared on one side (of course I figured that out later than sooner...) mine went right-to-left easily.

(1) Trim a large metal paperclip such that you can pin the spring into the trigger (small temporary pin)

(2) Install trigger and press down with all your might so that it's lined up with the proper frame holes.

(3) Push a punch through the frame to push the temporary paperclip pin out, while exerting force on the spring.

(4) Now tap the real roll pin back through the other way pushing the punch back out of the frame.

Oh, and I had to carefully dremel the u-shape (slightly enlarge) in the flat trigger where the bar hooks up, as there wasn't enough pivot room.

[xorbe]

Photo of my completed trigger install work.  The adjustment screws are really slick!

[Jack Straw]

Congratulations on getting the job done.  Your invention is called a "slave pin".  A job-specific pin is available from Miossi Gun Works and some of us use a short length of aerosol spray straw for that (thanks to schmeky).

Using a too small diameter slave pin can be very tricky as it can get cocked and not line up with the pin hole.  Next time you do one of these you might try a slave pin as close in diameter to the regular trigger pin as possible.

Two tips;

1. Make sure you use blue Loctite on the two trigger adj. screws.   They WILL move if you don't secure them.

2. Angus recommends NOT using the stock roll pin with the aluminum trigger.   CZ Custom has a specific trigger pin of solid steel which does not need to be staked. 

[1SOW]

+1 Thanks to Smecky

  That new pin is a big improvement.  One end has an enlarged diameter that locks in the hole.  It can still be staked but mine has been holding without staking it. 

[xorbe]

So the czcustom trigger pin isn't "flared", but instead the diameter increases slightly at one end, so as to wedge into the frame more securely?

About the slave pin, first I tried a round toothpick twice (good fit), but the strong spring tension ripped up both toothpick attempts in a hurry ...

Yeah, I read about the need for Loctite to keep the adjustments in place -- need to go get some, or touch them with a dot of paint.

[1SOW]

Yes the pin is larger on one end and seats firmly.  The other end is approx. the same size as the old pin.

[xorbe]

Finally got it to the local range today.  I fired a several single shots sans mag, and inspected the sear position against the hammer each time to make sure everything was locked up tight and proper.  Used the 15# spring and didn't have any problems with 3 kinds of ammo.  Didn't tighten my grips well enough (was attempting to not over-tighten ...)

I'm still out whether I like my modded 75B or stock FNP-9 trigger better.  I certainly prefer the CZ otherwise.  The CZ has a very short engagement, whereas the FN has a long pull but the entire mechanism is engaged, moving and smooth the whole way -- no pressure change through the pull.

Or, without the adjustment screws on the CZ, the initial trigger movement is not engaged with moving the sear at all, so right before it fires, there is a pressure change on the trigger.

Perhaps I should try a DA-only hammer setup with a light DA pull ... if such a thing exists ... I know the DA pull on the FN is a work-out!!

[phrozenlikwid]

You should go ahead and break down and snatch up the Angus hammer.  Maybe snag a 15lb mainspring at the same time.

The hammer changes the geometry of the hammer/sear junction, and absolutely does wonders to a trigger.  Makes a SAO reaaaaaaaal crisp, and will reduce the pull some.  Outside of that, if you haven't gotten rid of the FPB yet, you should.  Those changes listed above (plus the trigger which you already have) are about 75-80% of a real good trigger job.  The rest is polishing, and some fine tweaking.  It will be an absolute night and day difference.  All my SAO guns are equipped as so, and they are some of the better SA triggers I've ever played with.

[JFern]

I found that the hammer pins make excellent "slave" pins for taking out and re-installing the trigger pin.

[frgood]

I found that the hammer pins make excellent "slave" pins for taking out and re-installing the trigger pin.

Thanks for that one!! 

[wildcatfan.62]

I know this is an old post but I must say thank you!   I was going crazy trying to figure out how to install a new trigger  spring from Cajun Gun Works.   Didn't think about making a slave pin to hold everything together.  I used part of a heavy binder clip that I cut down to size.  Once I used the slave pin it was a 5 min install. 

Thank goodness for this forum and googleweb......

[M1A4ME]

Save the slave pin.

You'll buy more CZ's.

You'll change more trigger return springs.

[Obiwan]

Interesting. (I'm obviously seeing this for the first time...). I've always used small pliers (usually a Leatherman) to grab the spring and shove it down into the trigger.

[cntrydawwwg]

Interesting. (I'm obviously seeing this for the first time...). I've always used small pliers (usually a Leatherman) to grab the spring and shove it down into the trigger.

  I do this too Obiwan. Only I wrap electrical tape around the jaws. The jaws can scratch the spring, and once scratched, can shorten the life of said spring.

[bsand]

Interesting. (I'm obviously seeing this for the first time...). I've always used small pliers (usually a Leatherman) to grab the spring and shove it down into the trigger.

I used a pair of tweezers and cgw floating trigger pin. 5 minutes including disassembly. Didn't need to use the slave pin that came with it either. Just started the pin in the trigger, held trigger return spring down with punch, uses thumb to insert spring and done! No need to press in a pin or stake it. Super easy and worth every penny (cgw floating pin and reduced trigger spring).

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