For the experts

[Alexisrq]

I wonder if you're over analyzing it just a bit; from those two pictures, it looks pretty typical,

That could be a possibility, I have OCD when it comes to weapons

Done with the bolt stop, here are the findings,

Bolt stop box – K12 on top an “o” on the inside
Ejector – K on the side
Bolt catch screw – no markings
Bolt stop spring – has a “j”

[touhy]

I guess I'm pretty late to this old thread.
But that bolt is humped....I.e faked numbers