out of curiosity, why did you guys change your trigger? Was it too hard? Too abrupt? I have to say i have no problems with my 17HMR. Unless of course I know no better as I have never fired one with an after market trigger...
Because the stock trigger is not that great, you can use a shim kit to get rid of some of the pre-travel
and a lighter spring will lighten the pull, but even then you will have over travel which in stock form is not adjustable.
Yes you can drill and tap the rear of the trigger guard and use a set screw as a trigger stop to eliminate the over travel
but then you can't easily remove the bolt, without removing the screw, not ideal.
Fitting the Timney unit will give you a trigger that has a clean crisp pull with no over travel, that once adjusted will stay
as you set it, for years to come.
This unit also does away with the standard trigger sear, it's pivot pin and the nasty ball and spring that retains it.
There is another replacement trigger, much cheaper, but it still uses the standard sear assembly, and still makes no
allowance for adjusting over travel. Lets face it the CZ trigger may be good compared to many other rimfires, but it's
rubbish compared to most c/f rifles, and most of us complain bitterly about them.
Neil.