I have just purchased a brand new POF P308. I finally got my optics mounted and went off to the range to zero it it(It was also the first time it was being shot)

I was using PMAGs and Remmington .308 UMC ammo 150gr

Here are the issues I encountered.
1. The spent case was being ejected but another round was not chambering leaving me having to recharge the rifle
2. The spent case was being ejected and 2 rounds were trying to feed at the same time.
3. The bold was not locking back on the last round

Keep in mind I had no failure to ejects just feeding issues.

I did check the piston but was unable to determine which way it was put in(when I slid the gun forward it flew out and hit the floor without me catching it)

I also ran the gun not dry but not overly lubed so I was wondering if this could have had something to do with it?

I did speak to the dealer and they were great about it and will take care of whatever problem it may be without any expense on my part but was hoping to avoid having to send it back.
Any and all input would be appreciated

Thanks