Arsenal used to make them. I had a lemon that a local smith had to help me with to get working 100%. It was the 106CR version. Beryl’s should be good to go out of the box.
I build my AKs from flats and kit parts. And Arsenals are too expensive, especially after all the trouble AK Operators Union had with the 107. I just got a M&P 15 Sport II so I dont need another 5.56 rifle. Im not a fan of the caliber in the first place.