Expired Sold Looking for Magazine for SIG Sauer P230 9mm (Police 9x18 Ultra variant) Magazine

I found this interesting so I thought I'd share before I deleted.

I can't believe I've never tested this.
I guess I'm not looking any longer, since I have several to test with.

ChatGPT re-checked, ditched hearsay, and pulled actual receipts. Here’s what’s solid:

* **The cartridges:** 9×18 Ultra (aka 9 mm Police) is a hair longer than .380 ACP, but they share essentially the same case head and bullet diameter. C.I.P. tables list .380 case length 17.33 mm, OAL 25.00 mm; 9×18 Ultra case length 18.00 mm, OAL 25.50 mm. Translation: stack height and feed geometry are close enough that a .380 P230 mag generally accepts 9×18 Ultra. ([bobp.cip-bobp.org][1])

* **The gun/mag format:** Factory P230s were made in 9×18 Ultra for European police (Zurich, etc.), still with 7-round mags just like the .380 versions. ([edelweissarms.com][2], [heldef.ch][3])

* **Real-world usage:** Multiple owners report running 9×18 Ultra in standard P230 .380 magazines without issues. That’s anecdotal, but it aligns with the C.I.P. dimensions above. ([Gunboards][4], [The Firing Line][5])

* **Marketplace tells:** You’ll see OEM mags explicitly sold as fitting **both** “.380” and “9mm Ultra/9mm Police,” which is a pretty loud hint they’re the same physical magazine. ([eBay][6])

What I **can’t** produce is a SIG factory parts sheet that spells out “same mag, different caliber,” and I’m not going to pretend otherwise. Given the tiny dimensional delta, the 7-round spec on both, and user reports, the practical bottom line is:

### Bottom line

* **Yes:** P230 **.380 magazines typically work** in the P230 9×18 Ultra variant. Use quality OEM mags when possible. ([Gunboards][4])
* **No:** This has nothing to do with 9×18 **Makarov**. Wrong cartridge, larger bullet diameter, wrong party. Don’t mix them. ([Wikipedia][7])

### Buying sanity check

* OEM P230 mags are scarce and pricey; \$100–200 used is common. Aftermarket (Promag) is cheaper but hit-or-miss. ([Reddit][8], [GunMag Warehouse][9])

### Quick function test before you trust it

Load with snap caps, check feed angle and slide lock on empty, shoot a box of your actual 9×18 Ultra. If it nose-dives or fails to lock back, that mag goes to the naughty pile.

Subject: Looking for SIG Sauer P230 9mm Ultra Magazine

Hello,

I’m currently seeking a magazine compatible with the SIG Sauer P230 chambered in 9mm Ultra (Police 9x18 Ultra variant). Due to the rarity of this model, finding a replacement magazine has been a challenge.

If you have one available for sale or know where I might find a reliable source, I’d greatly appreciate any information or assistance.

Thank you very much!

Best regards,