Went to the range today with a pal, who produced a CZ-100 from his range bag. I didn't even know he owned the thing. Anyway, he got it all loaded up and the trigger has zero resistance. The used gun is fairly new to him, but he fired it once about 6 months ago. Only other handling was slide removal for cleaning. He did not do any dis-assembly, other than the standard slide removal. The gun is as clean as new, and is very low mileage. It looks brand new.
This is a striker-fired gun, and the first I've ever seen. At first I thought the mag tripped a mechanism and he simply had the wrong mag, but he just has the one mag and no other handguns. Very strange.
Any guidance highly appreciated.