I dont know if they are all the same, but of the two I handled, the one that had the action smoothed showed a lot of difference and was well worth it. Still a very ###y and accurate gun.
I found this post:
http://p201.ezboard.com/fczechpistols82792frm15.showMessage?topicID=659.topic about how to do it yourself.
Strip the frame and slide down to al of its components, debur, stone and polish all moving parts and do the same to the frame and slide. Polish all pins, polish the inside of the main spring, reshape the hammer strut. This will reduce a lot of friction. Next is to cut the sear face and hammer face and hooks, stone and polish the sides of the sear and hammer and don't forget the hammer way in the frame and interior of the sear cage and FPB lever nd plunger. Do the same for the slide, with a round Arkansas stone lightly stone the plunger hole and firing pin channel. Make sure the springs are polished on the interior and exterior with 800 grit paper and honing oil.
Reassemble and if you did it right is should be like a new gun.
Jim
Miossi Gun Works LLC
702 Park Dr
Monticello, IA 52310
Obviously, no warranty or guarantee is expressed or implied, and I wont be held liable if you make a mess of it.
J