MONKEY
Even though you purchased the WC X-Compact Grip (3.6" Barrel) for your X-Compact you could have also purchased the Carry II (3.6" Barrel) for your X-Compact and you would have the Full Grip with the Magwell.
You would need to use 17 & 21 Round magazines.
The only thing that Wilson Combat did to make a X-Compact Grip was to cut off the Magwell to make the Grip itself shorter so the Grip will accept a 15 Round Magazine.
No other dimensions have been changed between The X-Compact & the Carry II Grips.
The Carry Grips were designed to fit 3.9" Barrels as in the Compact, Carry & X-Carry Slides.
The Carry II Grips were designed to fit 3.6" Barrels as in the X-Compact / Sub-Compact.
To make the Carry II... Wilson Combat cut .3" off of the Dust Cover where the Picatinny Rails are...thus 3.9" became a 3.6" Grip.
No other dimensions were changed and the Full Grip & Magwell remained between the Carry & Carry II Grips.
So it is simple..just think of the Carry II as the Shorter version of the Carry.
The X-Compact Grip is a Carry II with the Magwell cut off to accept a shorter 15 Round Magazine.
The Compact Grip is a Carry Grip with the Magwell cut off to accept 15 Round Magazines.
That's the crux of Wilson Combat Grips.
If you think about it..It sounds a lot more Confusing than it really is..
Everything is built around the Wilson Combat "Full Size" 4.7" Barrel Grip..
Just a Cut Here and a Cut there so the Same Grip can accommodate different Length Slides and Magazines.
I put a Wilson Grip under my Compact RX Slide which is a 3.9" Slide.
So with a 3.9" Slide I had 3 choices...
* Carry Grip with Magwell and 17 & 21 Round Magazines.
* Compact Grip without the Magwell but the Grip will accept a 15, 17 & 21 Round Magazines.
* Carry II Grip with Magwell and 17 & 21 Round Magazines
The 3.9" Compact Slide will extend past the Dust Cover / Picatinny Rail by .3"..Some people like that look.
I chose the Carry Grip because I would rather have the Full Magwell Grip..even though I had to purchase a 17 Round Magazine to Fit the Grip.
I tried a WC Compact Grip but I did not like the fit with my Pinky resting on the 15 round mag Basepad.
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If you have a 3.6" Slide you have 2 choices for a Wilson Combat Grip.
* X-Compact without Magwell and 15, 17 & 21 Round Magazines.
* Carry II With a Magwell but uses 17 & 21 Round Magazines
It's that simple.