I have a 75c and have not shot it much. I just like it because it is so short and light and holds 12-14 rounds. The bolt is slow to return sometimes and caused a FTE once. I have cleaned it, but, I think I may have to download a manual and disassemble the whole thing with the trigger out to clean it properly.
I have been using bulk Federal, sometimes this week my bulk CCI arrives and I plan on taking it to a range where I can see how it does at 100 yards.
My first mistake was not tilting the gun on it's side and removing the tube feed all the way. The cartridges fell out of what I now know is the feed hole in the tube, luckily I realized it once I got to 20 :-D