I've been looking online. It's hard to tell looking at pics.

Do you lose the rear sight when adding the Romeo? I can't tell if the rear sight is part of the plate or just behind it.

EDIT TO ADD:
2 part question: Anyone put the 320 X-Carry FCU & Slide on a sub-compact 320 frame yet? How's it fit?

Yes, you will lose the rear sight.

Same issue as the full size P320 X5. Only the RX platform offers dual sight options at this point.

As others stated, yes you lose the rear sight.

quote:

2 part question: Anyone put the 320 X-Carry FCU & Slide on a sub-compact 320 frame yet? How's it fit?

No idea but they worked fine on a P320 Compact grip.

quote:

320 X-Carry FCU

There is zero difference between that FCU and the others in the line.