when you pull out the bolt pin, if you cock the handle back as far as you can, does the sled clear the body, enough for you to "fold it over"?
If not, see if there is some grooves on the pump guide rod coming out of the banjo that you can grip with an adjustable wrench and unscrew. That thick black guide rod is only screwed into the gun about 1/2", so if you can unscrew that, you can simply twist the pump handle & guide rod assembly to the side, and carefully slide it towards the back of the gun till the sled is free
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