F4, the trick to taking it apart after you make sure it is unloaded (the luger upper is completely capable of firing when when off the frame) is to push back on the barrel so the toggle lugs just contact the the frame ears, and pull the assembly disconnect lever into a 90 degree down position. Remove the side plate and then you can slide the upper forward off the lower frame. pushing the upper back relieves the spring pressure on the disconnect lever.
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