There is a boatload of pressed M 30 pills going around, and none of them contain oxycodone. They're all pressed with some form of Fentanyl or its analogues. Nobody can tell you with certainty what's in them unless you send them out and get them tested at a lab.
I have gotten to know lots of people recently that were taking these for months, some as high as 14 pills a day, all smoked or snorted. Every single one of them had complications with switching to suboxone, some waited a day, some waited a day and a half until in full blown withdrawals. Whatever they're pressing them with accumulates in the body and sticks around for a long long time. The leading theory is that it's fentanyl or one of its analogue cousins which is fat soluble and just builds up, making the switch to suboxone without PWDs next to impossible using traditional methods.
I'd stay well clear of these pressed M 30's, because I never hear anything good about them.