I believe that's a standard P365 module you have there. The X and XL modules would fit that 12-round magazine flush to the grip.

I wonder if these would fit your Wilson Combat grip module.

12 Round Sleeve for SIG P365

Designed to remove the wiggle the Sig 12 round base pad has. Available in two options, Pinky or Straight. DOES NOT INCLUDE MAGAZINE. No capacity added to factory magazine. Compatible with Standard or SAS Frames only and: P365 Micro Compact 12rd 9mm Magazine (SIG Magazine Link) P365XL Micro...

tactical.dev

 

12 rd mags come with an adapter baseplate to fit the P365 module.

 

OP, as @Andy105 said, the 12-rnd mags come with an adapter that slips over the baseplate. I have a 12-rounder and 15-rounder, each of which came with adapters. Look in the packaging that came with your mag to find it.

 

So the 12rd mag fit flush on my 365x factory grip module but the Wilson module is the shorter 365 module. Guess I’ll try the 12rd sleeve or buy 10 rd mags.

 

Just wondering if the OP intentionally bought a WC P365 module for a P365X OEM unit.

Anyways, sending an email to Armory Craft if he has any of those pinky extensions for such scenarios might also help.

 

 

I have 3 ten rounders on Marketplace and a sleeve for the 12-round.

 

I have a 12 round mag spacer in coyote.

 

Price? Including shipping to area code 75402

 

Clearly a 'base' WC 365 (NOT X / XL) grip.

For the 12 rnd 365 x/xl mag to fit you need the extension sleeve and baseplate (the 12 rnd baseplate will not work with the sleeve).
Depending on how you bought the gun, the extension & matching plate may not have been included tho when you buy just the mag it comes boxed with all 3 bits.

So to fix your issue you will need to purchase either the Sig sleeve/plate or one of the aftermarket variants.

 

Looks like you ordered the wrong WC module. 365 instead of 365X/XL. See if WC will exchange it for you.

 

Thanks everyone for the help as I am new to the Sig family. Look like I should have ordered the xl module in order to utilize my 12rd mags but with that said I kinda like the shorter module for concealment purposes. I’ll grab a few 10rd mags and see how it does… I can always get a Wilson xl module or use the factory if need be. Thanks again