SAR USA ST4512 ST45 12rd 45 ACP Black Steel
https://www.tandktactical.com/shop/858763007862-sar-usa-st4512-st45-12rd-45-acp-black-steel-21689
https://www.tandktactical.com/web/image/product.template/21689/image_1920?unique=1950684
This magazine is compatible with your SAR USA ST45.
