Problem with removing barrel from receiver

[Alan Ebright]

I worked the top lever and open/closed the action a few times. Didn’t dry fire w the snap caps for fear it would lock up again. Everything worked, but the top lever motion feels gummy and the action is really tight.

[Scott Gentry]

Had exact problem with a 20 Repro, gun got hot and would not open. Needs to be taken down and get the dried up grease/ oil cleaned out and lightly re oiled at right spots. Would not be shocked to see it double on occasion, have had to do this to 3 different un-shot guns.
Find someone familiar with doubles and single triggers, not average gunsmith.

Good luck.