If you have dual sling studs you can use a rail adapter, Atlas makes a good one, Wolverine sells them, like this:
https://www.wolverinesupplies.com/Pr...-4--1913-Rail-
If you only have one sling stud, you'll want something similar to the Harris Stud Rail Adapter. Many versions out there, the Harris is the best I found. Main drawback for those kind of adapters is they're pretty tall.