From the 1 manual safety 320 FCU I saw it looks like its almost totally different. The slide from my standard non safety compact fit and functioned on the manual safety FCU and grip module.
I'd say the only way to achieve what you're trying would be to buy a thumb safety 320 compact and an RX compact, and switch the slides. Sig CS said they may offer an RX conversion kit at "some time in the future" the last time I called, so that might be an option down the line.
I'd say the only way to achieve what you're trying would be to buy a thumb safety 320 compact and an RX compact, and switch the slides. Sig CS said they may offer an RX conversion kit at "some time in the future" the last time I called, so that might be an option down the line.