The 12 will without the extended baseplate but the 10 will not.
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Will my 365 10 and 12 round magazines fit in a 365 xl grip module?
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10-XL Conversion Basepad for SIG P365XL
This basepad replacement will allow SIG P365 10 round mags to fit in the P365 XL Grip Frame. NOT FOR 10 ROUND LIMITED MAGS that came with the P365XL (look for the dimple on the side of the mag). Those are physically longer and are compatible with any of our 12 rnd basepads designed for the XL...tactical.dev
I'm using 4 of the bases for 10-round mags converted for the X frame. No problems at all... Very nice. Fits and functions like it's oem...Interesting.. Didn't know that existed.
From their website/page...I have lots of the TD base plates versions for 356 and XL mags - and I am a big fan of them. I do need to point out that they are great for carry, but have limitations in a hard training environment. They do not survive long being dropped free onto a hard surface floor as you'd do in a "run-n-gun" class or competition (broke 2 quickly to find out). To TDs credit, they do caution that their base plates are not recommended for this type of use (I knew this and tried them out anyway to see - and found out). Just my experience
These conversions are for normal use .. I have 2 with no problems at all ..I have lots of the TD base plates versions for 356 and XL mags - and I am a big fan of them. I do need to point out that they are great for carry, but have limitations in a hard training environment. They do not survive long being dropped free onto a hard surface floor as you'd do in a "run-n-gun" class or competition (broke 2 quickly to find out). To TDs credit, they do caution that their base plates are not recommended for this type of use (I knew this and tried them out anyway to see - and found out). Just my experience
Weighted XL Flat Basepad for SIG P365 XLFrom their website/page...
"While this basepad is tested to survive the occasional drop, repeated tactical, or emergency reloads on hard surfaces, are beyond a polymer basepad’s design parameters. If your use case requires that, please see our metal basepad products."
I wouldn't mind finding a metal basepad... Only metal basepad I've seen on their site is this:
AXL-15 Aluminum XL15 Round base pads for Sig P365X/XL