GingisK wrote:
The barrel must be machines on a metal lathe. One must either make or buy a chamber reamer.
Marktwain replies:
The designers of the FGC-9 claim the barrels are useable without being machined on a lathe. They claim the chamber can be formed with electro-chemical machining. Using the electro-chemical machining, at least one maker reports accuracy approaching that of the ordinary Glock pistol.
Smith & Wesson has used electro-chemical machining to rifle its pistol barrels for a long time, so the technique is capable of precise work.
As with most things, initial attempts by amateurs usually do not equal production by skilled professionals.
That is true as long as you can find a chunk of pipe that fits the ammunition you will use.
They claim the chamber can be formed with electro-chemical machining.
Also true. But, if not reamed and polished, a casing will stick in the chamber when fired.
Using the electro-chemical machining, at least one maker reports accuracy approaching that of the ordinary Glock pistol.
Glock follows up with reaming and polishing. electro-chemical machining leaves a rough finish.
While machining isn't strictly necessary, weapons made in that fashion will not have the range or accuracy. The bullet often "key-holes" in the target because they tumble when fired from some of those weapons.