May 12, 2018, 04:55 PM
cworetiredSig 320
Can a FCU that has not been upgraded be used in a frame that has? Thanks
May 12, 2018, 05:34 PM
RichNI'm not sure what you are asking. The FCU is the frame.
If you mean grip module, nothing changes on it for the upgrade.
If you mean slide, then no, an upgraded frame/FCU will not work with a non-upgraded slide.
I think an upgraded slide will work on a non-upgraded frame/FCU, but I'm not sure if there are any safety/reliability ramifications.
May 12, 2018, 05:58 PM
mrwYes it should but I have never tried it.