I will add one thing here. That is the ejector can rotate out of position on its pin, which isn't bad because the bolt will not open when this happens. But my gunsmith friends and myself get to do more "repairs" when this has happened, it's really simple but ......... so just saying be awareIt isn't rocket surgery... a couple of pins drop out the trigger group and the bolt drops down from that. Needn't go any further than that. Conceptually similar to an 870 breakdown.
Many aftermarket manufacturers of 10/22 receivers have added a cleaning port on the back of the receiver block so you can clean the barrel from the breach end not the muzzle.