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Abraham wrote:What is a grip shell?

Thanks!

https://www.sigsauer.com/store/parts/grip-modules.html

You can change out the grip module to configure to what ever size you want (modularity). Also allows you to take the fcu (fire control unit) which technically to gun and swap out different calibers and for sub compact to full size.

Just google 320 modularity.

Where were you able to find the small size grip module for the compact?