Firing Pin, Roller and Extractor Installation Instructions
How to install replacement firing pins in a CZ-52 pistol:
WARNING! WARNING! WARNING! WARNING!
Warning — Installing a different firing pin,
other than the FACTORY replacement
OR the Harrington Products CZ-52-1 will
DISABLE THE FIRING PIN SAFETY.
Warning! The Harrington CZ-52-2, CZ-52-3 and CZ-50/70-2 firing pin kits effectively disable the firing pin block safety. Instead we use a spring return to retract the firing pin. If the decocker on your CZ-52 is defective (and many are... do the pencil test — put a pencil into the barrel and activate the decocker — if the pencil moves at all, the decocker is basically a trigger!), installing these firing pin kits may increase the chance of a negligent discharge (this is no such thing as an "accidental" discharge). If you do not feel comfortable with this idea, please do not install this kit in your pistol.
BE CAREFUL PLEASE!!!
WARNING! WARNING! WARNING! WARNING!
Step-By-Step Installation Instructions
The following shows how to replace the firing pin, extractor, and rollers with Harrington Products upgrades. If you are only upgrading some of your parts, use the appropriate steps of the following. Refer to the ČZ-52 exploded diagram for details.
1. Verify that the pistol is unloaded
Remove the magazine and verify that the chamber is empty.
It sounds trite, but please be extremely careful and make certain that the weapon is unloaded.
2. Remove the slide from the frame
While pulling back only slightly on the slide, pull the takedown latch down.
The slide can now be lifted forward and off the frame, as shown below.
3. Remove the barrel from the slide (if replacing rollers)
The barrel, recoil spring, roller cam and rollers are all assembled into the slide.
This must be disassembled if the rollers are to be replaced with Harrington Products hardened rollers.
Here you see the slide assembly from the bottom. The muzzle is at the top, the hammer will be at the bottom.
The original CZ-52 user's manual said to use the forward lip of the floor plate of the magazine to remove the barrel by using that lip to pull on the slot in the barrel just forward of the rollers. This is why CZ-52 magazines often have bent floor plates!
Here you see a Harrington Products barrel tool about to be inserted in the hole at the rear of the barrel's chamber block. A 1/8" or 3/16" punch could be used as a substitute, but this specially designed tool makes this easy.
Use the barrel take-down tool to compress the recoil spring and move the barrel forward.
When the rollers have moved far enough forward, the rear of the barrel can be lifted out of the slide.
This is where a specially designed take-down tool is very helpful.
The recoil spring is compressed well beyond its normal range. Without the proper tool there is a very good chance that you might launch either the barrel or the slide across the room!
Remove the barrel from the slide.
4. Replace the rollers
Do this if you are going to replace your rollers with Harrington Products' hardened rollers.
Here you see the barrel with the roller cam fully to the rear.
Here the cam has been moved as far forward as the roller cam retaining pin allows it to travel.
The rollers can retract and unlock the barrel, but the rollers cannot be removed.
Drift the roller cam retaining pin out of place with a 1/16" punch.
You do not need to remove it, just move it far enough that the roller cam can travel farther forward and allow the rollers to be removed.