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9/19/2017 7:27:10 PM
Posted: 1/17/2006 3:56:25 PM EDT
To install the port door spring.

Thanks
Link Posted: 1/17/2006 4:01:03 PM EDT
Well the easiest way would be to buy an upper receiver with the port door and spring already installed

Hey you asked for the easiest!
Link Posted: 1/17/2006 10:10:02 PM EDT
The easiest way is to compare it to the door on another rifle.

The long end of the spring goes toward the front, with the long end pointing down and resting on the open door. The short end is to the rear with the short end pointing up and resting on the receiver. You need to give the spring an extra twist and hold it in place, along with the door. Then just slide the pin through both.

For the door pin:

On a stripped receiver, you can just slide it in from the front with the c-clip on the rod.
On an assembled upper, slide it in from the back and then install the c-clip.
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