Yup, that's a good one... My brother and I clear up the pasture of the gopher population every so often with his $50 princess auto special. They are jumpy to shoot for sure but once you get past that it's fun. I put 500 cpum's through it and the groups were terrible (still). 3-4" at 15 yards. Chrony averaged 720 fps... So I built a spring compressor, disassembled, and found two holes in the piston seal. Found out from some learned (and appreciated) people that the piston cylinder was slamming into the end of the compression chamber.