[Boge]

...I have discovered the safety had slipped off into fire position on each of my 4 Sig P938/P238s while the pistol was firmly in its holster on my waist. This is always discovered at the end of the day when removing the pistol from the holster...

That sounds to me as if you have a holster problem and not a firearm one.

 

[Boge]

Forgive me, what do you mean by "FEG"?

Ugly Guns Welcome: The FEG Hi-Power Just Won't Quit :: Guns.com

The Browning Hi-Power is one of the most-serving and iconic pistols of all time. It spawned many variations over the years. We took a look at a well-used FEG Hi-Power from Hungary.

www.guns.com

 

[Boge]

...The ability to check safe status without removing the pistol from my holster is a huge advantage...

Now I know why you are having problems. Do not mess with any loaded handgun on your person to do any safety BS check as that is only monkeying with the gun and you will have, as you have discovered, problems. Buy a good holster and insert your CCW and then leave it alone until:

A. you need to use it

B. you are unholstering for the day, week, etc.

To constantly check a safety shows that you do not trust either the gun or yourself. Sorry to be honest, but if you fear the gun then don't carry it.

 

[Boge]

"I have discovered the safety had slipped off into fire position on each of my 4 Sig P938/P238s while the pistol was firmly in its holster on my waist".

This happens on all three of my Kimber Micros as well.

Are you fellas by chance using cheapo nylon Uncle Mike type holsters? Safeties (in working order) don't just mysteriously change positions unless something physically moved them. Of course, if a person is obese then I suppose a "love handle" bearing down...

 

[Boge]

I appendix carry. I don’t like having the hammer dig into my gut so the SFS system offers a comfortable solution to this issue.