Mini SMG bolt...?

[Jack007]

I figured Dave or one of the other experts might ID this Mini SMG bolt?
Specifically the letter "P"?
I got some IMI Israeli ones back around 1992 and mine don't have any markings like this? I know some parts like bbls had P stampings. For years they were supposed to be Pretoria. Then I thought that was debunked and it simply meant...proofed?

https://www.gunbroker.com/item/889964948

 

[RoverDave]

I don't recall seeing that marking before. It's different than the Pretoria markings of old found on the fullsize UZI, and different than the proof marking that IMI sometimes used.

 

[trilogymac]

Found this Micro FA bolt on GB in a kit. "P" marked as well.