Changing handgun caliber - Need registration?

[tnh10]

Hopefully someone can help with this discussion:

I have an old 1911 frame registered for 45acp. I am thinking of building a 9mm upper using the old frame. Is there a way to update DOJ that the old serial number is now chambered in 9mm? Is this even necessary to update DOJ?

Any advice would be great.

Thank you.

[Cokebottle]

Not needed.

[kcheung2]

No requirement to tell DOJ, ATF, local sheriff, Obama, or your grandmother.

[tnh10]

Not needed.

Thanks!

I couldn't find any rules or regs on DOJ website so I figured as much. The only thing I can think of that DOJ might make me do is complete the Firearm Ownership Record (BOF form 4542A) to update them and give them a $19 fee.

I had to use this form before to register a gun my deceased uncle left to me.

[Cokebottle]

Not needed for a simple caliber change.
Many people buy .40 cal Glocks and XDs and run them on a whim at 9, 40, or 357sig