Ruger 10/22 - where does this screw go?

[u/KS994]

Build:
- SBI ST/22 receiver
- factory 10/22 bolt
- SBI G3 chassis
- SBI minimalist stock
- Magpul K2 grip
- Magpul G2 flip up sights (plastic)
- CNC 10/22 trigger
- G3 handguard enclosure XL
- Olight Odin mini with pressure pad
- Magpul mlock vertical foregrip

While test fitting the 25/22 butler creek magazines, I watched as this screw dropped out of no where (pretty sure it fell from the rifle). Ever since, I took it apart and can’t locate a single point where this screw came off from. Does anyone know if such screw even exists on any of these parts? It may very well be that the screw came from something else and was just magnetized along somewhere on the rifle lol. The screw is very small, star pattern and silver/stainless steel looking.

Thanks!!!

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