I ended up using the new rivets after honing them down a bit and doing some cold blue on the the exposed side. It doesn't matter since they're covered up by a shell carrier. It might be a while before I can give it a test, but function seems to be in order, no binding or slop in the barrel.

History repeats itself because it worked. If it didn’t work in the first place, it wouldn’t be history but another lost story of insignificance.