[roel_v]

At work so can't watch videos on rifling a barrel, but can this tooling also be DIY'ed? I imagine rifling is 'just' a matter of using a very thin, very long cutter on a suitable lathe, but then I would think it would be pretty hard to make such a cutter yourself.

[bsder]

> At work so can't watch videos on rifling a barrel, but can this tooling also be DIY'ed?

There are a zillion videos on YouTube about this.

The hard part isn't the rifling, it's cutting the bore. After that, you can "just" push a rifling button through it and it will cut the rifling.

[convolvatron]

haven't looked at rifling, but making single point boring cutters for a lathe isn't at all hard. you can just screw a carbide cutting insert onto any old piece of steel.

seems like you'd have stiffness problems for long barrels (?)

[dsfyu404ed]

You could make a push broach that holds an insert (or make it out of HSS then press it through the barrel.