SBR procedure overview?

[Great-Kazoo]

DO NOT PUT MULTI in section 4c , for Caliber

[BuffCyclist]

DO NOT PUT MULTI in section 4c , for Caliber

How come? And what do you put down then if the lower says Multi?

If you put down 5.56 or .223Rem, can you change out the upper later to have, say, a 300AAC Blackout upper?

[Hoser]

How come? And what do you put down then if the lower says Multi?

If you put down 5.56 or .223Rem, can you change out the upper later to have, say, a 300AAC Blackout upper?

Changing calibers or barrel lengths is not a permanent change.

Just pick one and go with it.

I have a form 4 from long ago where I listed MULTI and it went through. Now days they kick them back.

[BuffCyclist]

Ah, gotcha, so it doesn't matter what you put unless you want it kicked back. Thanks!

[Great-Kazoo]

How come? And what do you put down then if the lower says Multi?

If you put down 5.56 or .223Rem, can you change out the upper later to have, say, a 300AAC Blackout upper?

Ah, gotcha, so it doesn't matter what you put unless you want it kicked back. Thanks!

yes and maybe. If the lower is anything other than a dedicated 9, 45, 22lr etc. I go with 5.56 . if you have a dedicated DDLES then you put 9mm.

You may temporarily alter the caliber provided you can restore it to the original configuration (meaning you can put a 22 conversion on your 5.56 SBR for a cheap range trip), but you should still keep the 5.56 upper.

[J]

To expand... you can temporarily change the length/caliber at will. So keep the other upper, and you are fine.

However, if you ever want to rebuild your primary upper in a different length or caliber, it is just mailing to the ATF to inform them that the change has happened. There is no approval, or waiting. Just send it in and make your change, so it isn't as big of a deal as some make it out to be.

[Hound]

Another way is to buy a factory SBR lower so you dont have to screw with engraving your trust name on it. Thats how I went many years ago.

How does this help?

Also, so if you are building a 300BLK and the lower states 'multi' you should still put down 5.56 on the form to make things easier? Even if you plan to run multiple uppers?

[Tim K]

Can I use multiple short barreled uppers on the SBRd lower? It requires a paperwork change?

I don't know that I care, just trying to understand.

[mtnrider]

How does this help?

Also, so if you are building a 300BLK and the lower states 'multi' you should still put down 5.56 on the form to make things easier?

I that case you would put 300BLK on the form and engrave CAL 300blk on the lower. My lower was a factory "multi" and I engraved CAL 5.56 on it alomg with my trust name and city.

[Circuits]

Also, so if you are building a 300BLK and the lower states 'multi' you should still put down 5.56 on the form to make things easier? Even if you plan to run multiple uppers?

If you put multi on your Form 1, the BATFE will not approve your form.
If you put down more than one caliber on your Form 1, the BATFE will not approve your form.

So even if your lower says "MULTI", you put down the ONE caliber you first intend to build it in. The manufacturer can get away with marking receivers multi because they are produced as receivers only, so have no caliber until they are someday fitted with a barrel. An SBR must have a rifled barrel, so it must have a caliber, and the BATFE wants a description of the firearm as you will first build it.