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DIY guns: here's what you need to make a proper barrel
The barrel is one of the most critical parts of any firearms. Maybe you want to do a gun with a 3D printer, or start from a blank/disabled weapon: you will need a proper barrel. I'm not an expert, but I'll share all the knowledge I have.
When you buy a pipe with a 9 mm ID, you'll find that a 9mm bullet won't go go through. You need to wide the hole a little more, something like 9.03-9.04 mm. An adjustable reamer with the correct reaming range will do the trick. For example, a 8-9.25 mm reamer in this case. If your pipe is very long and the reamer short, you'll need to extend the reamer handle with a tool, you can even improvise one gluing the end of the reamer with a pipe using epoxy resin.
Tip: a digital caliper is very useful to know the exact diameter you are getting, and it's a cheap tool.
You need to chamber one end of the tube in order to fit the bullet case. For pistols, it's usually easy. For example, for .380 ACP, is just reaming the first 17 mm of the tube with a 9.5 mm reamer. Other features depend on your gun characteristics: making a slot in one side for the extractor pin, or sanding the bottom to make the ramp. A Dremel is what you need here.
For long guns, a chamber reamer is required. It's easy to get, but quite expensive.
Without rifling, you will have a smoothbore barrel. The bullet will display erratic behaviors, rifling your barrel is highly recommended. Get a rifling button for the desired caliber, an ejector pin and pass the rifling button through your pipe with a hammer. Of course, if you have an hydraulic press, use it.
This is what you need to make a proper barrel. Don't forget to clean it before testing it in order to remove any debris. Always start with low loads to detect any malfunction.