Magpul UBR install guide and pictorial review

[Stickman]

For rifles stocks, you should see the round receiver extension (buffer tube). Using a wrench, grab the end of the tube and turn counter clockwise to LOOSEN it. For right now, just loosen it.

If replacing a carbine tube, loosen the castle nut all the way, then remove the plate and watch out for the spring. Then twist the tube out of the receiver.






The reason we want to loosen the receiver extension, but not remove it is because there is yet another spring captured piece, but this one is under quite a bit of pressure and will fly out if not held in position with your fingers. Once you have used your wrench to loosen the receiver extension, hold your finger over the buffer retaining pin (shown below) and gently release it as you unscrew the receiver from the tube.