P-07 Trigger and hammer questions

[Larry F]

I have a first generation CZ P07 Duty (S/N A77--) pistol and would appreciate input on changing my OEM Hammer for the Hammer used in the second generation (S/N BXXXX) pistols.  I'd like to know if it is interchangeable will my current hammer, ifit improves the trigger action, and will it affect the action's timing?  Thks, Larry

[SI VIS PACEM PARRABELLUM]

They will interchange and it will function just as the hammer you currently have does with likely no change in trigger feel. If you want a better trigger the Cajun Gun Works Omega hammer is what your going to want to look at along with many other accessories for the P series to enhance the action.

[Larry F]

Thanks for interchangeability info.  I'm also looking to know if the the hammer hooks and engagement depth was changed and if the safety stop ledge was better defined.  What I'm really looking to do is to firm up my SA sear release feel without going full bore to the CGW hammer which has a better hook profile but uses a really short hook depth engagement. 

I've finished the 4th upgrade to MY CZ 75 P07 Duty .40 pistol and have it tuned as well as I can get it (without going to the CGW Hammer) and do have a firmer SA trigger release feel but would like to stiffen it a bit more.  If CZ changed the hook profile and engagement depth slightly in the 2nd generation gun I may be able to achieve a slight improvement for less expenditure and not need to retime the action.   Thks, Larry   

[SI VIS PACEM PARRABELLUM]

I have spares of both 1st and 2nd gen omega hammers and other than the shape of the hammer everything else is the same. CGW does have some different weight sear springs for the omega guns that might be of some help achieving what you're after.

[Larry F]

Thanks.  This is my first experience with a CZ pistol - came about thru a spur of the minute barter earlier this fall with an acquaintance (my used golf club for his used CZ pistol).  I have some tuning experience with an old Sig P6 pistol and assumed I could employ it here.

Initially, I polished the action parts, tensioned the trigger bar spring, 14# mainspring, lighter CGW trigger return spring, .020 CGW sear spring, and subsequently reduced the sear side to side movement with the CGW sear pin after blueing the sear and hammer surfaces and then dressing the sear just above it's hook to get it to mate with the hammer as the sear releases, and lastly, an oversize roller to fix the timing problem I had just created.  I started with 10# Plus DA and 3.5# SA trigger pull weights and they are now 7# DA and 3.5# minus SA.  the SA release has firmed up appreciably but still has a softer feel than my Sig P6 with the same trigger pull weight.  The last change I'm planning at this point is the .022" CGW sear spring.

I'm probably pushing a wet upstream at this point but  hoped to get some meaningful counsel from experienced CZ guys thru this forum.  I've invested slightly over $100 to date in parts (though (35% is shipping costs) and reluctant to spend another $100 for the CGW hammer if I can avoid it (this is what drove my question about the 2nd generation hammer.  Thks, Larry     

[M1A4ME]

Do you carry it cocked and locked (safeties) or with the decockers?

If it's carried cocked and locked how important is DA trigger pull?

Been some folks here in the past stated the opinion that a lighter hammer spring doesn't really help SA trigger pull and sometimes a heavier spring can get you a crisper SA trigger pull.

Not sure what's different about my DUTY model P07 but it came out of the box with around 3.25 lb. SA trigger pull that is very nice/crisp and a DA trigger pull of about 8.5 lbs. or so.  Over several years of use and with a CGW reduces power firing pin block spring, reduced power trigger return spring it's hovering at 3.0 SA trigger pull with no change in feel/crispness.  That trigger is still better than my other P07 (newer 9MM with a CZ Custom hammer - pretty sure it was a CZ Custom hammer I bought for it trying to get it to the old P07 DUTY level of feels good) or either P09.

[Larry F]

I use the Decocker.  I don't have a problem with the double action - it's now smoother and light enough at a 7# trigger pull weight. 

The only intentional change made affecting the SA trigger pull weight is to use CGW's .020" heavier sear spring to offset their lighter trigger return spring.  What I didn't like about the SA pull is how easy it was to trip the trigger before I intended to.  The heavier CGW sear spring has helped firm up the feel quite a bit.  I not locked in on a really light SA trigger pull and I'll try the heaviest (.022") CWG sear spring next.

 The gun works enough better now that it doesn't may sense to buy CGW's hammer.  My interest in the 2nd generation hammer was to see if it changes the way the sear releases from the hammer hooks (i.e. get a CGW hammer improvement, polish it up, and have better performance on the cheap).

I've learned not to try to do much with the sear and hammer - Just truing up the sear's disengagement face as it pull away from the hammer hooks caused the hammer to rock back slightly as trigger was pull in SA and I had to put in an oversize roller to get the action back in time.  Thks, Larry

[SI VIS PACEM PARRABELLUM]

I've learned not to try to do much with the sear and hammer - Just truing up the sear's disengagement face as it pull away from the hammer hooks caused the hammer to rock back slightly as trigger was pull in SA and I had to put in an oversize roller to get the action back in time.  Thks, Larry

Had you looked closely at the way the hammer moves as the trigger is pulled BEFORE you did any work on the action you would have likely noticed the rocking back of the hammer existed at that time as well. This is what we call camming back and the condition is usually present on more than 90% of service grade hammer fired CZ pistols whether it be the Omega line or the standard 75 series.

[Larry F]

Maybe, but if so it wasn't obvious.  After I trued up the sear to hammer fit, the SA changed dramatically.  the backward motion became obvious and the the trigger pull started with a hitch and snapping noise.  I measured the roller OD at .218" and switched to a .225 OD roller after talking with Dave at CGW. 

He thought my action timing was right on the edge as it left the factory and my tinkering had changed the decocker to trigger bar fit and thrown the action out of time.  the .225 OD roller has eliminated the hitch and noise as the trigger is pulled, and if there is any hammer rollback, I can't see it.  What I can tell is the double action trigger pull seems shorter - assume from the roller size difference?

I also just talked with CGW about the impact of their different Sear Springs on SA trigger pull weights and feel.  I bought 2 sear springs when I started my tinkering to try to firm up the SA feel as the sear releases ( a 51822 Omega series spring and a 90001 P series spring).  I'm using the 90001 spring (.020" wire with 7+ coils) and now find it has been discontinued and they options are now the previously available .022" natural colored wire spring and a new red spring that is stiffer than the .022" wire spring. 

I've now ordered one of each to see want effect they produce.  What I'm really after now is end up up with firm sear release feel with a reasonably light trigger pull weight.  Tks,  Larry 


Correction - The fit problem was between the the trigger bar and disconnector wing - not the decocker.  Thks, Larry