I thought I would start with the barrel first. It was not a good one at the
crown end. You might want to stick a pellet down the ends of the barrel, to keep
out debris. Bad barrels on the left, a good barrel on the right. Red lines on
the bad crowns should actually be the same length.
1- First cut off about a 1/4" or so. This can be done with a miterbox and a
hacksaw or a small lathe works well.
2- Chuck the barrell up in a 1/2" drill once you have the drill secured in a vice
drill press or the lathe. Take a file to the sharp outside edge just a little
is all you need. A piece of wood keeps the bearings of your drill a bit more happy.
3- Now for the crown, I have used many objects with round ends for this, a piece
of 600 grit wet dry sandpaper held over the round end of the bolt handle, in
this case, works well. As the barrell spins push the paper against the end. Yes,
you can use something more abrasive to start. You could also put the barrel in a vice and
the screw in the drill for the crowning. A nice sharp 5/16ths bit in the
lathe is even easier.
There are lots of ways to do this, this is one which works for me and it's fast.
See barrel port mod for info on barrel breach.
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