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Yeah they render them unable to fire in some manner. I was at some museum (I forget where) and got to talk to the "armorer" who did that.
Were they restorable?
My understanding is a lot of museum weapons get the bolts welded closed inside the receiver. Others have crucial componets (firing pins) removed and stored or thrown away.
Things welded shut, things removed...
...at least here in the US.
At a museum I visited in Austria, there was absolutely no indication of any type of "deactivation" whatsoever. That included everything from small arms to artillery. A Flak 88 on its AA mount didn't appear to be missing any components whatsoever, and the breech was open so that visitors could look through the gun. Could it be possible that certain internal components were missing from these pieces? Yes, it's possible. But it still is in stark contrast to much of what I have seen on display in the US, where often there are externally-visible indications of "deactivation", such as obviously missing parts and visible welds over openings or what should be moving parts.
It's really quite ridiculous to deactivate the large pieces like artillery. It accomplishes nothing but destruction and defacement of history. Arguments as to criminal use of stolen weapons cannot be reasonably applied to such ordnance, given that one would still have to source the ammunition even after undertaking the immense task of stealing a rather large piece of equipment from a museum. I don't know if you've checked around, but I don't exactly see many sources of 8.8cm flak shells around these days.