You got it... The GI sights.
Took the RIA 1911 to the range today. It's no Kimber, but it wasn't bad. Desperately needs new sights though. Any smiths in SoMD that could do the simple job?
I'm not sure what you are looking to spend on sights but there are a few options.
You can buy some aftermarket GI Style sights that have better visibility and save on the machine work. There are plenty of good sights out there that will fit the slide you currently have. You just need someone to install them for you.
You can send the slide off to Novak and have them machine the front and rear of the slide which will give you more options and have them install their sights. That'll be a bit more money.
https://www.novaksights.com/Products.aspx?CAT=9473
Take a day and drive to Scott's Gunsmithing and explain what you would like to have done and drop it off. It'll cost some time and money but his work is top notch. If you pick the sights out and order them, you may be able to call them and see about just mailing the slide up but for me, personally, I like to go up there and shoot the $hit with him anyways.