Installing a trigger guard on an AR-15 is probably the step that most often leads to failure for a novice assembling their first lower. Left unsupported, the ears that hold the roll pin, which secures the rear portion of the trigger guard, can easily break off.
Step by Step
- Gently tap the pin into the top ear. Do not drive the pin too far or you will not be able to insert the trigger guard.
- Place the rear of the trigger guard between the ears.
- Using a steel punch, continue to tap the roll pin in.
- Make sure that the lower ear is supported when driving the pin.
- Continue to drive the pin until it is flush with the ear.
- If you are using a standard trigger guard, depress the detent on the front of the trigger guard and slide it into place.
We chose to install a MagPul MOE synthetic trigger guard, which is held in place with a small hex-drive set screw.