Just got this off Gunbroker, 1994 Pre B transitional with a 6" polygonal barrel custom fitted in Germany, supposedly long before CZ offered 6" barrels. The seller only realized it was done by Peters Stahl when preparing for shipping. DA is 8 lbs and SA is barely 2 lbs, very crisp with a short reset. It's very dirty so I detail stripped it today to get it ready for the range next week. It's impressive how good the trigger is considering the hammer spring is very heavy, probably the factory original, and there's not much polishing at all, no mirror finish to be found inside anywhere, not even the pins.
Besides the obvious barrel fitting and the target sights, a number of customizations I assume done by Peters Stahl:
The hammer was grounded thinner to lighten it.
The firing pin shoulder seems cut to lengthen the stroke.
The trigger bar is drilled and tapped towards the rear on one side with a set screw installed.
The sear cage is drilled and tapped on both sides and screwed to both sides of the frame. See the small flat head screw next to the safety.
Anyone here familiar with #3 and #4?