The little ejector ( plunger) , sticks... sometimes... I took it apart and can't find anything wrong or dirty.

Any ideas?

Over time with recoil the the cutout in the plunger body can develop a slight burr where it contacts the cross pin. It may only be visible under magnification. This burr can and does retard/seize the ejector. Inspect this and stone/polish away if found. Powder residue can infiltrate the ejector mortise too making it sluggish. Also check the spring. They can weaken. It should take moderate force to push a case against the ejector.

If it ever sticks and won't spring out soak ejector with Marvel Mystery Oil while gently heating with a propane torch. Let this cool and then heat again until the oil starts to bubble. Remove the cross pin. Point bolt head into a towel. The ejector will usually be propelled out by pressure.

The most common is dirt and rust. I always clean and oil.

Burrs next.

Could have been when you took it apart the problem went some place.

It is really a simple item.

Thanks for the info, I'll do as you say and see what happens.

Terry