Hi Mario and welcome. Yes, they use the same magazine tube design, and this will work 100% in the Sar9 ST Pistol. Cheers, stay safe and enjoy!

Yep!

💯 % yes!! Will fit & function properly.

Good evening to you!! I've seen both yes and no answers when searching for compatibility. So It is strongly recommended to contact SAR USA directly or consult with a qualified gunsmith to confirm magazine compatibility before purchasing or attempting to use a magazine designed for a different SAR model in your SAR 9 ST pistol. This will ensure proper function and safety. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'merica' 🇺🇸🇺🇸

Yep, good to go!

Hi Mario, yes sir, SAR9 magazines are compatible with the SAR9 ST model. Both share similar design features, allowing for magazine interchangeability.
Stay safe & have a great day!