Handgun enthusiasts today have more options than ever before when it comes to the size and fit. Users of the Sig Sauer P320 are no exception. The Sig P320 comes in four different sizes (Full Size, Carry, Compact and Sub Compact) and each size has either two or three grip module sizes available. Each grip module has a two or three letter designation on the lower part of the backstrap. Below is a table showing all possible letter combinations for the eleven grip module options. The black box denotes the size module that comes with the firearm from the factory.
We hope this helps shed a little light on which P320 model and size you have.