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The X-GRIP Sig Sauer Magazine Adapter for Compact/Sub-Compact Models will not work with the Sig P238. The X-GRIP Sig P238 Colt Mustang .380 Caliber Magazine Spacer will work with the P238. It will not increase capacity though, but it can be found at the link below.
https://www.opticsplanet.com/x-grip-sig-p238-colt-mustang-380-caliber-magazine-spacer.html
There unfortunately is not a X-GRIP Sig Sauer Magazine Adapter for Compact/Sub-Compact Models for a .45ACP P320. I recommend contacting X-Grips to confirm compatibility of the .40 S&W model with the .45ACP Sig P320.
Currently we do not.
No it will not.
As the expert, Jeremy stated, you can use the X-GRIP on a Sig P-320 subcompact. However, you can't use the X-GRIP as a pinky extension on the 12 round subcompact magazine because the magazine won't lock. What I use is a 15 round magazine with the X-GRIP in the subcompact. That way, I have 3 additional bullets plus I also have enough grip due to the use of the X-GRIP. I bought my X-GRIP from Top Gun Supply. Here is the link: https://www.topgunsupply.com/x-grip-sig-sauer-p320sc-p250sc.html . BTW, by using these X-GRIPS, I can use full size, 17 round magazines in my P320-Compact instead of the 15-round mags. I hope this helps!
According to Sig Sauer, this unit works with SIGSAUER factory original new style P320/250 magazines and pistols only.
MPN: XGS320250SC would install onto a Sig P320 Compact magazine (ie. 15 round 9mm) for extra grip space if used with the P320 Sub-Compact.