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Firstly, remove the Top Cover and the Recoil Spring Assembly... (you might also remove other internal parts for your convenience...)
Drive the Pivot Pin out from the bottom of the Receiver using pin punch and hammer... (note: the Pivot Pin is quite tight...)
Remove the original Folding Stock, install the Folding Stock Adapter and the Pivot Pin...
Drive the Pivot Pin all the way in using pin punch and hammer...
It is really tight...
Finally, tighten the set screw at the back of the Folding Stock Adapter to fix its position...
Installation complete. Assemble the airsoft gun and let's see how to operate the Folding Stock Adapter...
The Folding Stock Adapter works well with AR-type buttstocks of different size and style...
Press the button on the receiver to fold the stock, and it will be locked in place...
Press the Folding Stock Adapter downward to unlock and extend the stock. Thanks for watching.