I can't leave well enough alone. My 922 was shooting just fine, no problems, and quite accurate too. I emailed Daisy and they sent me a .pdf version of the owners manual. I thought that was outstanding that Daisy would do that for a gun that hasn't been made in 20+ years. Anyhow, per the owners manual, the 922 was only rated at 530 fps at 10 pumps. I thought I'd see if I could improve on that. I made an adjustable delrin piston to see if I can squeeze a little better performance out of it. Here are some pics of the new piston (and the old one) and the complete rifle with a vintage Weaver 2.5X scope. I don't yet have a chrony, but I'll let yall know if I perceive any improvements.
Almost forgot, I also used JB weld to glue the plastic bushing that holds the muzzle end of the barrel liner in place. It was loose in the outer "sleeve".