I received my stamp back on my SBR and suppressor and need to have my suppressor and SBR engraved.

Do I need to complete a 5320.20 for shipping it to a gunsmith for engraving? The gunsmith is in another state.

I wouldn't think so.  But l don't know.

So in for the correct answer.

, you can if you want to but it's not necessary
I've sent mg's and spr out many times and never filled one out.
Just send a copy of your form with the gun is good enough.

A form 20, 5320.20 is not needed for shipping. That is an application to transport across state lines. You are not transporting anything, you are shipping so a form 20 doesn’t apply. A form-5 is used to temporarily transfer title-2 firearms to a SOT holder for repair purposes. The form-5 isn’t a requirement, but is recommended by ATF. Some gunsmiths will work on title-2 items without a form-5, some require a form-5 for cya. As an aside, a form 20 is not necessary for suppressors.

A SBR is only a SBR when it’s assembled into a configuration that meets the criteria of SBR. A lower receiver by itself does not meet this criteria.

Given that this is a form-1 home build can, it’s not currently assembled as a suppressor and is just a tube. That is also not yet a suppressor.

I have had work done on many title-2 items and have never used a form-5. The receiving SOT doing the gunsmithing asked that I include a letter detailing the work to be done and a copy of my form-4 or form-1.

If your parts are as benign as others have eluded, go ahead.
A tube is a tube and a title 1 receiver is just that, non-NFA.

This is incorrect, as written. Simply because a silencer is disassembled doesn't remove it from the purview of the NFA.
If you engrave before your stamp is approved or before you begin assembly it has yet become a silencer part and isn't a firearm.
If the silencer was built before engraving, it's a silencer tube and, therefore, a firearm. Lack of engraving doesn't remove it from the definition of silencer, either.

Neither your suppressor or SBR should be made yet.

With that said, No .20 is needed to ship a non-firearm, or even an NFA firearm.

nm....

Even after you get the lower engraved and your stamp back or vice verse, your receiver is only a SBR when it’s configured as such.  So even if you have a stamp and engraving, put a 16” or longer barrel on it and it’s no longer an SBR.

No problem to send without form. As long as they are a dealer. I just sent off my most recent sbr reciever to get engraved to orion-arms.com. they had a very quick turnaround and were $20 cheaper then the competitor.