Odd Screw in Rear Sight?

[Ms15710]

The rifle is admittedly not mine, I saw it as a listing online. It is a 6 digit Winchester with Winchester parts (although not contemporary to the receiver).

It is a peculiar piece that stuck out to me. I doubt any armorer would jerry-rig a design like that at an arsenal.

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[browningautorifle]

I doubt any armorer would jerry-rig a design like that at an arsenal.

No, correct screws are even available to the layman...

[RCS]

It is not just a small machine screw but manufactured to fit the pinion and hold the elevation knob tight

[browningautorifle]

not just a small machine screw

Well, the outside screw is a screw...and it's wrong. The outside is holding things tight I guess.