Pachmayr's Grip Extender will greatly increase your control and shooting comfort when added to popular compact and sub-compact handguns. The extension perfectly matchs the shape and texture of the handgun, so they look like they are part of the pistol, rather than an add-on. It is easy to install and are made of tough, high strength polymer that stands up to the roughest handling.
This model is compatible with your Sig P320 and comes in a pack of two.