Installing a new trigger on your SIG Sauer P220 can make the pistol easier to shoot. On average, the SIG Sauer P series of pistols have a wider grip than most other pistols. This makes it more difficult for some to properly grip it while keeping the correct part of their finger on the trigger. Installing a thinner trigger will alleviate this issue for most people. This modification only changes the width of the trigger and not the trigger reset distance.
Remove the magazine, pull back on the slide and lock the slide back. Visually inspect the chamber to make sure it is empty. Rotate the takedown lever clockwise until it is pointing down.
Grasp the slide firmly, pull it back and then push forward to remove the slide from the frame. Push down on the decocking lever until the hammer is decocked. Unscrew the grip frame screws from the right side of the pistol and remove the grip panel.
Rotate the takedown lever until it points upwards and pull it away from the frame until it stops moving. Rotate the takedown lever clockwise until the lever is free of the frame.
Locate the large metal block inside the frame; this is the locking insert. Grasp the locking insert with the thumb and forefinger and pull it upwards and towards the muzzle end of the frame. The hammer must be decocked for the locking insert to be removed. Do not lose the slide catch spring as you remove the insert. Remove the steel spring on the right side of the frame.
Look at the pivot pin just above the trigger on the left side and make a note of the position the pivot pin is in. You will need to replace the pin in this exact position to reinstall the locking insert. Push out the pivot pin using the small screwdriver and remove the slide catch.
Push down on the trigger bar and push it towards the muzzle end. Wiggle the trigger bar back and forth while pushing up on the trigger until it comes out.
Remove the old trigger from the pin and insert the new trigger facing the same way. Insert the new assembly with the trigger bar going into the frame first. Wiggle the trigger bar until it is in the same position as before.
Replace the pivot pin, spring and slide catch. Rotate the pivot pin with the small screwdriver until it is in the same position as before and the notches on the pin are facing upward. Insert the slide catch spring in the locking insert and replace the locking insert. If it does not seat properly, wiggle the pivot pin with the small screwdriver until it locks in place.
Insert the takedown lever pointing upwards and screw it in while pushing on it until it seats properly. Rotate the lever down and replace the slide. Lock the slide back, rotate the takedown lever counterclockwise and pull back on the slide to release it.
Point the pistol in a safe direction and dry fire it to confirm the trigger is installed properly.
Items you will need
- Flathead screwdriver
- Replacement trigger
- Small flathead screwdriver
- While you have the weapon partially disassembled, you can take this opportunity to clean and lightly lubricate the parts.
- Always make sure the firearm is unloaded before working on it.
- "P220: Instructions for Armorers"; SIG Sauer
- SIG Sauer: P220 Exploded View
- David De Lossy/Photodisc/Getty Images