This thread lit a fire under my butt to replace the pump cup on my 100, I was able to get it shooting almost as fast but not as consistant as it shoots now, by doing an alcohol flush followed with a judicious oiling, but that was short lived, a few weeks later it was back to no compression. New pump cup and all is good, but could use a bit mor hammer spring to get crazy power. I also used the OE rear sight mount hole to mount a Williams D5 sight. Also tried alloy pellets to see if it meets MFG claims LOL
The one I just received has what maybe OEM reproduction sight mount and repro. tombstone peep…it does ok at 30 feet but I do get the dreaded spider web …good luck