Those multishot kits are great, sometimes need a bit of a fiddle to get them working smoothly but once they are they stay that way for ages! Keep the orings lubed or they wear and a dry one can pull the probe oring off when pulling the bolt back.
A complete kit that works well has got to be worth £40, more if you have more than 1 mag rotor.
HFT, for people with only 2 buttucks!
VooDoo TwoTwo The next chapter.