Armory Craft Sig Sauer P365 XMACRO / FUSE Enhanced Backstrap
 
This back strap is ergonomically-superior to the factory part.
 
It has improved hexagonal texturing and a 'slightly increased arch' vs. OEM, which will help improve overall grip and control of your firearm, leading to improved performance and accuracy. Made out of durable black polymer. Weight: 14g / 0.5oz.
 
Fits 'ONLY' P365 XMACRO & FUSE Grip Modules
Can be used with or without a magwell
Works with factory as well as aftermarket magwells