Sounds like you shouldn’t have any problem answering these questions then:

1. What does the machine itself cost?
2. What grades of metal is the spindle able to cut and what is suitable for a safe and reliable firearm?
3. What tool heads are needed to manufacture each part of a gun?
4. For each of those tools, cutting that material, what is a good RPM and feed rate?
5. Do any parts require precise realignment as part of a tool change or when changing the orientation of a part?
6. How much stock is required for a semi-automatic rifle and what does it cost?
7. What have you personally manufactured and on what machines? Regular old mills and lathes are fine.

Alternatively, you could go on record saying that absolutely none of those things matter for gun manufacturing.