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Get the trigger kit from dave (sells them on ebay and is from BC). I have one in my american and it dropped the trigger pull down to 2 pounds with no creep and it was $20. Oh and it takes all of 5 min to install.
I just cut down the spring a coil and backed off the adjusting nut all the way down and it was all I wanted. Creep doesn't seem excessive, so I haven't bothered with the shims. You could try it, it costs nothing to cut off a 1/2 a coil at a time and taper the end on a fine grinder.
Dave sells his kits off of ebay. If you type in cz 452 on ebay it will be there. If not I believe his user name on here is yodave. It's a great kit and i think you'll love it.
I bought my kit directly from Eric Brooks :ebrooks77@hotmail.com
My CZ 452 Varminter was 3lbs 2oz (1400g) before installing the kit and 4oz (110g) after.
Am very pleased with the result.