Now you can add the sling adapter and buffer-tube to the back of the AEG.

Start with the sling adapter. The protruding section go into the AEG and the wiring goes threw the middle.

Then with the wiring going threw the in slide the buffer-tube on to the back page of the body.

Then grab the large bolt with the washer piece attached and slide them into the back of the buffer-tube with the wring set underneath. Once the bolt is as far as it will go start screwing down the bolt using a long Philips screw driver.