Warning: Messing with the sear or the sear spring can cause accidental discharges or uncontrolled firing and messing with the main spring can cause light primer strikes. Do this with caution and test the firearm in a safe place to make sure it function properly.
Well I'm sure there a lot of you that have done trigger jobs but for those who haven't or don't know how to here you go.
This is a walk through of a customizable trigger job for the C9. How is it customizable? because the amount of trigger pull will be determined by the springs you chose. All of these steps can be done by them self's and do not need to be done together to work but the more you do the lighter your pull can be.
Alright to start off the tools you are going to need:
1/8 punch (optional)
Phone book or soft surface
Between 600-3000 grit sand paper.
Alright to start off pull the slide back and lock it in place with the safety. Now put your C9 on the phone book and take the 3/32 punch and hammer and remove the pin that holds the slide in place.
Now take the slide and the pin and sit them off to the side. Do not tip the slide as the mainspring and firing pin my fall out or just remove them and set them with the slide.
Now take the Phillips screwdriver and remove the grip on the right side of the gun or the side opposite to the mag release button.
Now remove the stock grip and be careful as there is a small spring in the stock grip and there is a wire that control the tension of the mag release bottom. The small spring in the grip is not required along with the mag break as it is not in my gun and not shown in the picture. Now in the picture you can see the arrow points to where to pieces of metal meet, you need to take whatever fine sand paper you have (I recommend somewhere between 600-3000 grit.) and sand where the metal surfaces meet to smooth them out and remove any burrs.
Now remove the sear and sear spring and set them off to the side and remove the metal peice shown in the last picture if you haven't already.
Now take the 1/16 punch and hammer and find the pin above the trigger that holds the trigger assembly in the gun and tap out the pin to remove the trigger. It will still have a piece of metal on it at this time.
This is what you will have removed
Now take the 1/16 punch and remove the little pin that holds the metal piece to the trigger itself.
Here are all the peices you should have when you remove and tear down the trigger assembly
The trigger spring should be located in the trigger in a hole made to seat the spring.
Now remove the spring if it has not already came out and replace this spring with a lighter spring of your liking. This alone will improve the trigger pull but works best in combination with the other mods. Now do not cut the spring and only replace it with a light spring of the same lenght.
Now onto the sear and sear spring, I personally sanded all of the sear with 3000 grit sand paper but that is not something you have to do and does not improve the pull much. The part you mod here again is the spring some people cut down the sear spring but that does not really help the trigger pull it just makes the trigger pull shorter and can be unsafe. Now when replacing the sear spring be careful not to go to light as it can cause accidental discharges, injury, or uncontrollable firing. I found a spring that was 3/4 strength of the original spring and it seems to work very well but this is something you will have to test.
Now onto the slide take one of the punches and remove the mainspring and firing pin if you haven't already.
Here is a picture of the new firing pin and main spring assembly and the old firing pin and mainspring assembly. which one you have will depend on when your gun was made or if you have upgraded to the new assembly.
Now this is the final part of the trigger job you can cut one or two coils off the mainspring to lighten the trigger pull or you can replace the springs with a lighter one. I personally think its better to replace them with a lighter spring because if it doesn't work when you try to shoot you will get a light strike on the bullets primer but you can not put coils back on once you cut them off so do little amounts at a time and reassemble if you are cutting coils.
This is the mainspring assembly I used to lighten the mainspring load.
Now reassemble the gun and test. Be safe as things like to light or to short of sear spring can cause the gun to fire be just the slide slamming.
Depending on what springs you used you can easily cut you trigger pull in half or less then that I actually had to put stronger springs in because it was to light for my liking. Have fun, Be safe, and good luck with your trigger job.