Safety spring for receiver, new, two one included in short length and one in long length. I cut these short length springs and they range from .25-.3 inches for the short spring and from .38-.45 inches for the long spring.
Since I cut them the ends are not flattened but they are significanty cheaper than the other springs I've come across.
Some paintguns require the longer spring and some need the shorter spring (this listing is for one of each).
Off the top of my head, the shorter spring works well:
in carbon fiber Automag frames with the set screw for the safety ball and spring
later sheridan frames with the set screw
some cocker frames with the set screw for the safety
Off the top of my head, the longer spring works well or needs to be slightly trimmed to work the best in:
in PTP benchmark automag frames,
I think Brass eagle nightmare crossman style frames
some cocker frames
nelson frames
sheridan frames