Installing SP-01 Safeties on CZ Shadow

[Stuart]

Sorry, was away fro thread. Yes, go more in green arrow direction. It needs to go a little deeper into the RHS.

[Onikudaki]

Sorry, was away fro thread. Yes, go more in green arrow direction. It needs to go a little deeper into the RHS.

Thanks for the info Stuart. I filed back the edge of the flat on the left side safety shaft and now the LS fully seats in the RS notch. Of course I butchered the flat surface on Wednesday thinking there was not enough clearance and managed to cant the angle of the flat surface so now the RS does not sit parallel with the LS when installed.

[Onikudaki]

So I decided to install the safeties in the gun for the heck of it to see how fitment was and how much I screwed things up. Surprisingly, once the safeties were in the gun; there is no play on the fitment of the LS in notch of the RS. Am I good to go here?

Pictures installed:



I have not made any fitting adjustments to the portion of the LS that interfaces with the sear. Function checking the safety: The safety will not engage when the hammer is down, the safety positively engages and will not let the hammer fall when the hammer is fully cocked. The safety will engage if the hammer is in the half cock position; is this last part normal?



From looking at the safety and sear interaction as the trigger is pulled (from the hammer down position) it looks like filing the face of the hook (red area in the picture below) would be the only fitting needed so that as the sear moves as the trigger cocks it and finally at the last portion before the hammer falls there is no interference from the safety on the movement of the sear throughout the trigger pull. Correct? Filing the blue area does not seem to have any effect on the interface between the sear and the safety when the safety is off and the trigger is being pulled from the hammer down position... If I were to be really specific it is more like the area right between the red and blue draw marks I made on the picture below that needs to be filed while still keeping that corners profile.

[NickS]

Onikudaki,
Being able to engage the safety at half cock is normal, but do not try to pull the trigger in this condition as it could damage the gun.
The work you have done should have had no effect on the DA pull. The DA pull is a function of the trigger bar and the disconnector. The sear plays no role in the DA stroke and neither does the safety work for DA as it only acts to prevent the sear tripping, and the sear only works from SA mode.
It is the blue area of the safety that blocks the sear arm and stops it from tilting to release the hammer hooks. If you can cock the hammer and engage the safety you should see the blue face is under the sear leg (if you can't engage the safety it needs fitting as described above). Squeezing the trigger at this point should see nothing happen. Now you should be able to flick the safety off (to fire) and still nothing should happen.
My main point is that the DA and SA functions are separate and use different parts to function.
Cheers

[Onikudaki]

Onikudaki,
Being able to engage the safety at half cock is normal, but do not try to pull the trigger in this condition as it could damage the gun.
The work you have done should have had no effect on the DA pull. The DA pull is a function of the trigger bar and the disconnector. The sear plays no role in the DA stroke and neither does the safety work for DA as it only acts to prevent the sear tripping, and the sear only works from SA mode.
It is the blue area of the safety that blocks the sear arm and stops it from tilting to release the hammer hooks. If you can cock the hammer and engage the safety you should see the blue face is under the sear leg (if you can't engage the safety it needs fitting as described above). Squeezing the trigger at this point should see nothing happen. Now you should be able to flick the safety off (to fire) and still nothing should happen.
My main point is that the DA and SA functions are separate and use different parts to function.
Cheers

Hey NickS,

DA pull is the same. Swapped the original safeties back in to test the trigger pull and it felt the same going between the two sets of safeties. Yes the blue area blocks the sear when the safety is engaged and nothing happens when the safety is disengaged until the trigger is pressed. Was able to make it out to the range today; everything functioned great and the DA pull did not seem any heavier with the standard SP-01 safeties installed. Thanks for the info!

[oldfrank]

On the two safties I did the only thing I had to do was lengthen the vertical flat so it would fit more into the right side safety.

Everything else fit and worked fine but the safety leg would not go into the right side safety far enough to allow the left side safety to correctly install.

[ES13Raven]

I'm going to install the thin safeties, but I don't have the tools to fit them yet. What kind of file is recommended for this?

Something like THIS?