Does anyone know who manufactures the optics included with the new PC Shield?

I'm debating between having my current Shield 1.0 milled and configured for Holosun 507k. I find that optic somewhat better than the Romeo or RMSc. There's no published info on the sight used by SW for their PC models with optic included.

But also considering cost of getting the m2.0 Shield with 4 inch barrel and having that slide milled for my own sight instead of getting model with optic of unknown origin.

Would optic by SW include lifetime warranty if included with the PC model? Or should I go route of just using my own optic?

Thanks for replies.

Oddly enough it's the Shield brand optic, they have two different ones and they are a little different in size and I am not sure exactly which one it is that's on the M&P

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