This is from my personal EDC gun. I put about 60-70 rounds through my brand new XMacro before switching to an aftermarket grip module. It comes with the original 2 additional backstraps. Shipping is $10. No FFL required. 

Sig Sauer Grip Module Features

Factory replacement for the P365-XMACRO grip module. The Sig Sauer Grip Module features a true 1913 accessory rail and three interchangeable backstraps (S, M, L) to ensure a proper fit for the user's hand. The medium backstrap comes preinstalled. The Sig Grip Module is compatible with the 17-round P365-XMACRO magazine and is compatible with all P365 FCUs except manual safety versions(firing control modules). Note: A compatible slide assembly and magazine must be used.

Sig Sauer Grip Module Specifications

  • Brand: Sig Sauer
  • Category: Frames
  • Model: Grip Module
  • Frame Finish: Black
  • Frame Material: Polymer
  • Hand: Right
  • Grips: Black Polymer
  • Gun Model: Sig P365-XMACRO
  • Gun Type: Pistol

Shipping is $10