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Lock the slide open and you will see a small hole in the recoil spring guide rod. Straighten out a paper clip and bend about 3/8" at one end to 90 degrees. Put the small bent end into that hole then remove the slide. You should now be able to pull the recoil spring guide assembly out as one unit with the paper clip preventing parts from siding to the end of the rod.

Now, make sure the barrel link is down and slide the barrel out the front of the slide (muzzle end)