I bought a yankee hill upper to put on my lower and I have a question about chambering…When I put a mag in and pull the charging handle back the round moves all the way forward and If i had to clear the chamber I couldnt due to the bullet be lodged to the point i have to use a cleaning rod with cotton tip and push the round out…Im use to my 5.56 that I load a round and I can clear the chamber and the round pops out the ejection port…
You might want to check the chamber dimensions. It sounds like it may be too tight. If so, it will only get worse after a round is fired due to case expansion.