[adriancr]

> The barrel can be rifled polygonally through electrochemical machining.

It's not fully 3d printed. 3d printed parts are fragile.

So what exactly are they banning?

Why not ban the electrochemical machining instead?

[imtringued]

It's a metal tube that has some plastic around it to make it comfortable to hold. They are basically banning the production of "comfort features", not weapons themselves.