10-03-2020, 02:37 AM
Another potential problem can be the cartridge head is not seating on the breach face of the bolt because of the ejector. Here is a link to discussion and mod to help improve feeding on some 6.5 Grendel AR-15s. Sounds like your AR-15 might be under gassed but people have experienced failure to feed because of the ejector. It cant hurt to mod the ejector.
http://bulletin.accurateshooter.com/2014...artridges/
http://bulletin.accurateshooter.com/2014...artridges/

