Tactical Development AXL-Hybrid Aluminum Basepad For 365 12rd OEM/Magguts Spring
 
Compatible with OEM & Magguts Magazine Springs/Followers
 
Tactical Development installation video HERE
 
Aluminum XL Hybrid ProLedge Basepad for SIG OEM Spring & Magguts Spring Kits (optional).
Fits:
12 Round P365 Mags (even the 10 round XL compliant mags)
12 Rounds with Sig OEM spring and provided insert.
14 Rounds with MagGuts springs kits (optional).
All XL length grips:
Sig Sauer: any that come with 12 round flush mag, or 10 round pinned mags in compliant state
Wilson Combat WCP365 XL,
Icarus Precision X Elite, Pro XL Elite, XL Hybrid, XL Hybrid Pro (see video they have many different frames),
Mischief Machine Alphas/Omega in XL/XXL 
 
Includes:
Aluminum Based Hard coat Type III anodized in black
Insert to switch between OEM and Magguts spring