Well Brooks is out of business, the rimfire magic one is only part of the full kit.
The full kit is now the Yodave kit, £15 ish from e-bay, sellers name is formeryodave, they come from Canada, item No
160800484012
The other options are the various adjustable sear kits, or the two replacement trigger, one from Rifle Basics, which I used for a short while, and
then dumped in favour of a Yodave kit, now on my one remaining rimfire I have a Timney trigger.
Yes the Timney is very good, but it is expensive, and needs a fair bit of inletting work.
Your choice at the end of the day, but with care the best trigger is the Yodave kit, but only if you are capable of setting it all up well.
For other options, like the "poor mans trigger job" do a search on the CZ forum within the the Rimfire Central Forum.
CZ / Brno - RFC Check the stickies out, with particular attention to
Sophia's answers to frequently asked questions
Neil.