I recently got a Topper .410 barrel for a good price because it was drilled and tapped crooked. A lot.
As a matter of fact, Seven 6-48 holes and a single 8-40 hole.
Three of them had white silicone caulk inside that I had to dig out…..
So, I used old scope mount screws to plug the holes, then bench ground them close, then filed them flush and sanded them and the barrel with emery cloth.
Plum Brown was used for a finish.
It fits and fires perfectly on my .218 Bee Topper- so it worked out well!
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