Hi Kiet, any standard single stack 1911 magazine will work. Here is a factory replacement budsgunshop.com/product_info.php/products_id/35328/rock+island+54169+1911+45+acp+1911+8rd+blued+detachable ,
Stay safe & have a great day!

Just about any standard single stack 1911 magazine. I personally grabbed a couple Wilson Combat mag 8 rounders & a Chip McCormick 10 round All run flawlessly.

Yes, other magazines can work with the Rock Island Armory 1911 GI ENTRY .45 ACP 5" 8RD. Here are a few compatible options:
Armscor ACT-MAG Rock Island 1911 .45 ACP 8-Round Magazine:
This magazine is specifically designed for Rock Island 1911 models and offers reliable performance.
Rock Island Armory 1911 Magazine .45 ACP 8 Rounds Steel Blued:
This magazine is made to Armscor/Rock Island Armory specifications, ensuring a perfect fit and operation.
Wilson Combat 1911 .45 ACP Magazines: Wilson are known for their high quality and reliability and should work well with your Rock Island 19113.

Hi Kiet and welcome. Most standard Single Stack 1911 Magazines will work no issue. Cheers and stay safe!