The guys at the AK Operators Union tested out the PTR Industries PTR-32 KFR Gen 2 rifle. This rifle has a delayed blowback roller-lock system and comes in 7.62×39. Think of it as an HK-91 but in 7.62×39.
My nephew and I had an opportunity to test fire a prototype of this rifle back in the summer of 2014 when we visited the PTR Industries factory in Aynor, South Carolina. What impressed me about the rifle was that the designers at PTR were working to make it take any AK magazine. According to the comments here, they pretty much succeeded with their Gen 2 version.