I had never taken one apart before. They are difficult to get a part because I think the exterior threaded shaft is two pieces and the top large OD piece is what needs to be unscrewed. 

This one lacked BBs so no bbs are shown in the photo.

Find Cocker Bolt retaining pins in various styles here:
http://www.baccipaintball.com/parts/semi/autococker/bolt-pins.html

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