You have to pull the barrel forward to remove the slide. Easiest thing to do is to retract the slide after cross pin is out, and just hold the muzzle around the gripping striations against spring tension, as you pull the muzzle away from the frame. That will remove the barrel-slide assembly from the frame. Then you can position the bushing in the catch notch. Easier to hold the muzzle end with a paper towel or shop rag, so it doesn’t slip.
If you get the barrel-slide assembly off but lose hold of the muzzle and it retracts back in the slide, push the feed ramp straight forward to compress the spring and again grab the muzzle striations. It helps to have a shop towel over the pointy parts of feed ramp. Pushing feed ramp in direction of muzzle will compress the spring. Then you can tilt the barrel away from top of slide and hook the bushing into the notch.
Edited by - Ben B. on February 21 2020 12:58:32 AM