There are many different ways to install an AR-15 trigger, and the process can vary depending on the specific trigger that you are using.
However, in general, the process typically involves removing several small screws from the gun’s housing to gain access to the internal mechanisms.
Once inside, you will need to remove the old trigger and replace it with the new one.
Carefully follow the instructions that came with your specific trigger to ensure a proper installation.
And be sure to test your work before firing your weapon by pulling the trigger gently a few times.
If everything feels okay, then you’re ready to take your rifle out for a spin!
You can take a look at the installation in the video:
Anonymous edited answer September 7, 2022