[shooter1201]

The MULTI-part plastic rear sight seems AS FRAGILE as Glock's 'GCA68-approved' rear sight.

Any STEEL ones available?

 

[NM_P99]

There are plenty of steel night sights available.
I recommend Meprolights or Trijicons.
My P99 has been thru 4 different training classes, and the Trijicons I installed are still attached, and working perfectly.

 

[Catbird]

I don't know how fragile the stock P99 sights are, but I am very pleased with my metal Meprolight night sights.  They were purchased from www.arizonagunrunners.com for $65.

 

[shooter1201]

Is a rear pusher required to install the rear sight, or are the rear Mepro sights 'punch proof'?

 

[NM_P99]

Just push down on the plunger and slide the Meps into the dovetail, they take a fair amount of finger pressure to go in, but no tools are required.
My Trijicons have been thru ####, and they are still attached, and they were pretty loose in the dovetail from the start., the Meps are a much tighter fit in the slide.
My Trijicons have been used in hundreds of one-handed racks, where the rear sight is hooked on my belt or holster, and used to cycle the slide, and its not gone flying yet.

 

[Catbird]

Just in case you didn't know (or forgot)...

the rear sight adjustment screw has ESREVER threads.