I put a new complete 5.56 upper on a Cmmg lower I’ve Had for years. It was a tight fit but not overly tight. The action fed dummy ammo Ok. I took it to the range and everything worked. Single rounds, 3 rounds rapid fire, and no problems. Then I tried to hand eject a chambered round. It took a younger stronger hand to do it. A fired round has enough energy to extract but my 76 year old arthritic hands aren’t strong enough.
What gives here?