I recommend asking Radical Firearms for a recommendation on a specific 5.56 Ejector for your 7.62x39mm AR. From what information I can find most AR's chambered in 7.62x39mm with 5.56 extractors have reliability issues.
The JP Enterprises Enhanced Ejector Kit would be compatible with your rifle. However, there are multiple possible reasons you are experiencing malfunctions with your rifle. I'd recommend emailing us at Techsales@opticsplanet.com and providing us with more information about your build including ammo type, buffer system, gas system etc. This way we can help you determine the possible causes of your malfunctions.
No, neither of those options would be compatible. You need to use an extractor specific to the 7.62x39.