I am new to CZ firearms after recently acquiring a 75D PCR. I upgraded the sights and installed a Cajun Race hammer and am very pleased with the result. I do have a question regarding the Fixing Insert. If you are unfamiliar with the part read the the below paragraph, if so you can probably skip past it.
From what I have read there are two basic favors to CZ75 pistols, (there may be more but for the purpose of this discussion play along) those with a Safety and those with a Decocker; the D in 75D PCR stands for Decocker. With the Safety, the sear box is an independent unit that is held in with the Safety lever, IOW the sear pin is only as wide as the sear box, so when you remove the safety, the sear box just pulls right out. With the Decoker the sear pin transects the the body of the gun, so you must remove the sear pin to remove the sear box, meaning the sear, levers and springs all come apart, unless you use a slave pin (slave pin is the width of the sear box and is pushed through the sear pin hole to replace the sear pin while hopefully keeping all the sear box parts connected; I failed both times I tried this meaning I spent some quality reassembling the sear box). In order to remove the sear pin with a Decocker, there is a 6mm disc on the left side covering the head of the sear pin. This disc, the Fixing Insert must be slide out of its position to remove sear pin.
It should be noted that apparently not all Decockers have this fixing insert. The apparent purpose is to prevent the pin from unintentionally walking out; there is a head on the pin so it only goes in from one side, properly left to right if the gun his being pointed away from you. It should also be noted the head of the sear pin (and fixing insert) is also covered by the Decocker thumb lever and is only visible when the Decocker thumb lever is pressed down. My question is has anyone without this Fixing Insert ever encountered the sear pin ever unintentionally walking out, or is this a solution looking for a problem? First the sear box is under spring tension and there are a number of friction points, the two holes in the main body, the two holes in the sear box and the levers and springs inside the sear box all conspiring to keep the sear pin in place. Further in the unlikely event the sear pin might start walking out it would only travel about 1mm before it runs into the Decocker thumb lever. Now I'll admit, if you had to rely on the Decocker thumb lever to retain the sear pin, that would certainly be justification for the fixing insert, but I decided to throw it in anyway because that's how my mind works and I can be an idiot sometimes.
So anyway that's my question. I certainly understand the logic of the CZ 75 is a great gun so the engineers obviously know what they are doing, but since it is anecdotally not on all Decockers (or perhaps it is and some have simply left it off) makes me wonder why it was added. On a schematic I have it shows it on a 75BD, which if I'm not mistaken is a steel body Decocker pistol, so it appears not to be specific to the aluminum body PCR.
