Help. AR ejection issue.

Recently bought this PWS second hand. First owner claimed he only shot around 200 rounds an it appears that way.

Right before he sold it to me he swapped back in the stock trigger. Previously had a Geissele trigger.

PWS MKIII Mod-2

I’ve taken it twice to the range and shot it suppressed and unsuppressed. Both times I’ve run into the same issue and trying to figure out what the hell is happening.

Rifle shoots perfectly fine both suppressed and unsuppresed. However. Let’s say in middle of shooting you want to stop & unload it. When I remove the mag and go to eject the live round via charging handle. The charging handle is frozen. Will not budge. Mortaring didn’t work. Didn’t try a mallet or anything. This has happened on both range trips. Only way to remove round is shoot it and it ejects normally.

What could the cause be? I just got home from the range and wanted to confirm it would do it again and it sure did. Going to try to inspect everything but would be helpful if anyone had similar issues or point out something I should look for.